About r/cybersecurity
In its own words:
This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc.
Community guide
r/cybersecurity (#680, about 1.6 million subscribers) — This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc. Recent posts show ~80 posts/day in recent posts (~77% text, ~22% link, ~1% video). Its public rules include: Read the FAQ before posting; Must be relevant to cybersecurity professionals; No low effort / poor quality posts; Security first / no editorializing; No advertising.
What belongs here
Stay inside the room’s stated scope rather than adjacent off-topic dumps. Self-promotion and ads are limited—read those rules before linking your own work. Low-effort memes/empty shitposts are often removed—add real context.
How it differs from lookalikes
Prefer this room when your post matches its description and rule list—not merely a larger sibling community. The public rule list is long enough that skimming all entries once beats assuming defaults from similar subs.
Practical pointers
Read the live sidebar/rules before posting; rules can change. Common flairs include: News - General, Business Security Questions & Discussion, Career Questions & Discussion, Personal Support & Help!.
The community was created on May 22, 2012, which makes it 14 years old. Since Nov 2, 2026, it has gained 5,258 subscribers (+0.34%). Among the 7 communities on our cybersecurity list it is the largest. It sits just behind r/Hololive (#677) and ahead of r/environment (#679) in our ranking.
What sets r/cybersecurity apart
Compared with other large communities, r/cybersecurity leans heavily on text posts (80% of recent posts; the typical Top 100 subreddit sits at 35%). For its size it is unusually busy: about 53.2 new posts a day per million members, more than 86% of the Top 100. It is also one of the faster-growing big communities: its 2.31% gain since Sep 19, 2026 beats 98% of the Top 100. Its rhythm is strongly tied to time zones: the busiest hour (17:00 UTC) sees about 4.3× as many posts as the quietest (01:00 UTC).
Subscriber growth
Between Sep 19, 2026 and Nov 9, 2026, r/cybersecurity climbed from 1,525,662 to 1,560,893 subscribers (+35.2K, +2.31%). That is about 691 new members per day. The chart shows 10 weekly subscriber counts.
Top posts on r/cybersecurity this week
The most upvoted posts of the past seven days, in the order Reddit ranks them (collected Nov 9, 2026).
- Hackers claim to have stolen 23TB of data from Russian statistics body, including Ukraine war casualty figures — Russian Federal State Statistics Service admits its servers were hit by coordinated cy…u/Firecracker048 · Nov 2 · link
- The Port That Does Not Exist - Port 0 is the port you are not supposed to use, so nobody looks there. So we put an IRC network on it. Then I got curious if anyone else had, & scanned all of IPv4 for …u/acidvegas · Nov 6 · link
- Attackers are scanning the internet for Linux servers vulnerable to CVE-2026-98432 (CVSS 9.8), a critical TCP race-condition flaw that could allow remote root access. Over 2.1 million servers reporte…u/i-shekhar · Nov 4 · text post
- Cops bust botnet of 1.3M infected Android TV boxesu/Major-Ferret5689 · Nov 3 · link
- I just woke up to someone remote controlling my desktopu/dimboostank · Nov 8 · text post
- CVE-2026-109518: Critical APT Vulnerability Allows Attackers to Bypass Package Verification and Execute Malicious Code as Root on Linuxu/i-shekhar · Nov 5 · link
- The PHP2Shell Vulnerability Heralds Cybersecurity Hell: AI is forcing us to pay off 40 years of technical debtu/IEEESpectrum · Nov 2 · link
- Is anyone else worried that AI is expanding the attack surface faster than we can defend it?u/SkyCompetitive148 · Nov 6 · text post
- Claude Code’s “Yes, and Don’t Ask Again” Option Can Leak Passwords and API Keys to GitHubu/Much-Television-9449 · Nov 7 · link
- openssh on musl linux has been letting people into password-less accounts since 2016u/ThisMachineIs4 · Nov 5 · link
All-time top posts
The highest-ranked posts in the history of r/cybersecurity, from 2019 to 2026, ranked by Reddit.
- Microsoft announces a massive 25% voluntary buyout layoffs program. This is an absolute bombshell in the tech sectoru/Exact-Advantage-3190 · Oct 26, 2026 · text post
- Recreating uncensored Epstein PDFs from leaked raw base64-encoded datau/mqudsi · Feb 5, 2026 · link
- “…analysts at the agency were verbally informed that they were not to follow or report on Russian threats” | Cybersecurity and Infrastructure Security Agency (Cisa) sets out new prioritiesu/HeyItsFudge · Feb 28, 2025 · link
- Southwest Airlines unaffected by outage because they're still running Windows 3.1u/skeeloco · Jul 19, 2024 · link
- Trump’s Defense Secretary Hegseth Orders Cyber Command to ‘Stand Down’ on All Russia Operationsu/Snowfish52 · Mar 2, 2025 · link
- Anyone Can Push Updates to the DOGE.gov Websiteu/EveYogaTech · Feb 14, 2025 · link
- The Internet goes on high alert after discovery of 8 compromised TLS certsu/OkVast2122 · Oct 20, 2026 · link
- Discord cuts ties with Peter Thiel–backed verification software after its code was found tied to U.S. surveillance effortsu/AmateurishExpertise · Feb 24, 2026 · link
- So… I all the ATOs for basically all of the government are just… voided? Musk is installing his own, non-cleared, servers on-prem to access govt systems.u/TheBoatyMcBoatFace · Feb 2, 2025 · link
- Bill Gates twitter was hacked😱Jul 15, 2020 · image
What r/cybersecurity talks about
We read the titles of 505 recent posts (Oct 31–Nov 7), the words that come up most are “security”, “attack”, “built”, “advice” and “help”. Other frequent themes are vulnerability, cyber, linux, job, looking and threat. Recurring phrases include “pass-ta-key golden”, “golden attack”, “google password” and “password manager”. By format, 80% are text posts, 19% are links and 1% are videos.
Popular post flairs: Business Security Questions & Discussion (84), News - General (80), Career Questions & Discussion (62), Personal Support & Help! (51), Other (48), AI Security (27).
Activity and best time to post
r/cybersecurity gets about 83 new posts a day. The public archive holds 246,534 posts and 1,643,726 comments in total, about 6.7 comments per post. Last week the busiest day was Thursday (98 posts) and the quietest was Sunday (44). Posting peaks around 17:00 UTC and is lowest around 01:00 UTC.
Rules of r/cybersecurity
The moderators of r/cybersecurity list 9 rules. In short:
- Read the FAQ before posting
- Must be relevant to cybersecurity professionals
- No low effort / poor quality posts
- Security first / no editorializing
- No advertising
- No excessive promotion
- No personally-identifiable information.
- Civility
- Ongoing security incidents are to be collated into one thread
How to join
Open reddit.com/r/cybersecurity and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many members does r/cybersecurity have?
r/cybersecurity has 1,560,893 subscribers (Nov 9, 2026), which makes it the #678 safe-for-work subreddit in the SubMouse ranking. It added 35,231 members between Sep 19, 2026 and Nov 9, 2026.
When was r/cybersecurity created?
r/cybersecurity was created on May 22, 2012, so it has been around for 14 years. The oldest post in the public archive is from Jun 20, 2012.
Is r/cybersecurity still active?
Yes. r/cybersecurity gets about 83 new posts a day (average of the last four weeks). Over its lifetime the archive counts 246,534 posts and 1,643,726 comments. In a sample of 505 recent posts we counted 430 different authors.
What is the best time to post in r/cybersecurity?
Based on post counts from Oct 31, 2026 to Nov 6, 2026, the busiest day was Thursday and the quietest Sunday, and most posts arrive around 17:00 UTC, with the fewest around 01:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What kind of posts are on r/cybersecurity?
The community describes itself as: “This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc.” Recent post titles often mention security, attack, built, advice and help. Most posts are text posts (80%).
Is r/cybersecurity SFW?
Yes. Reddit does not mark r/cybersecurity as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/cybersecurity?
Join the community on Reddit first, then use “Create post”. r/cybersecurity accepts both text and link posts, with polls enabled. It has 9 posted rules, starting with: “Read the FAQ before posting”; “Must be relevant to cybersecurity professionals”; “No low effort / poor quality posts”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/cybersecurity?
Communities with similar topics include r/Android (3.2M) and r/UFOs (4.2M).
Stats from public data (data updated Nov 9, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 9, 2026; top posts from Reddit’s public feeds). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/cybersecurity.