XBOW Blog
xbow.com · Company blog · on HN since 2024
XBOW's blog covers its AI penetration testing system, vulnerability findings, and evaluations of AI models for offensive security.
What HN saysHN commenters cite it as evidence that LLMs find bugs and write exploits, while another calls its Mythos evaluation an inflated PR stunt.
19HN people shared it
6linked it in comments
33stories submitted
564story points
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Most-shared posts
- 1Agents built from alloys5 people · 186 points · first shared 2025 · 80 comments on HN
- 2Mythos for Offensive Security: XBOW's Evaluation5 people · 4 points · first shared 2026 · 1 comments on HN
- 3XBOW: A new AI security company by the creators of GitHub Copilot3 people · 11 points · first shared 2024 · 2 comments on HN
- 4Finding a Critical Vulnerability in Scoold with AI3 people · 6 points · first shared 2024 · 1 comments on HN
- 5XBOW, an autonomous penetration tester, has reached the top spot on HackerOne2 people · 284 points · first shared 2025 · 123 comments on HN
- 6XML External Entity (XXE) Injection in Akamai CloudTest2 people · 10 points · first shared 2025 · 1 comments on HN
- 7AI now matches the capabilities of a top human pentester2 people · 6 points · first shared 2024 · 1 comments on HN
- 8XBOW AI autonomously discovers path traversal in EDDI (CVE-2024-53844)2 people · 2 points · first shared 2024 · discussion on HN
- 9GPT-5 doubles performance in offensive security benchmark1 people · 27 points · first shared 2025 · 3 comments on HN
- 10GPT-5.5: Mythos-Like Hacking, Open to All1 people · 4 points · first shared 2026 · discussion on HN
- 11Dead.letter (CVE-2026-45185) Humans vs. LLM for Unauthenticated RCE Race on Exim1 people · 4 points · first shared 2026 · discussion on HN
- 12Agents Found Three RCEs as SYSTEM (and root) on Bing Image Search1 people · 3 points · first shared 2026 · 1 comments on HN
- 13XBOW Battles Ninja Tables1 people · 3 points · first shared 2025 · discussion on HN
- 14XBOW1 people · 3 points · first shared 2024 · discussion on HN
- 15A Refreshing SQL Injection Discovery in Z-Push1 people · 2 points · first shared 2025 · discussion on HN
What HN people wrote when they linked it
wslh · 2026-04-01
While it's great to clarify, LLMs are actually finding bugs and writing exploits [1][2]. There are more example though.
[1] https://news.ycombinator.com/item?id=47589227
[2] https://xbow.com/
moyix · 2025-06-24
We've got a bunch of agent traces on the front page of the web site right now. We also have done writeups on individual vulnerabilities found by the system, mostly in open source right now (we did some fun scans of OSS projects found on Docker Hub). We have a bunch more coming up about the vulns found in bug bounty targets. The latter are bottlenecked by getting approval from the companies affected, unfortunately.
Some of my favorites from what we've released so far:
- Exploitation of an n-day RCE in Jenkins, where the agent managed to figure out the challenge environment was broken and used the RCE exploit to debug the server environment and work around the problem to solve the challenge: https://xbow.com/#debugging--testing--and-refining-a-jenkins-remote-co…
- Authentication bypass in Scoold that allowed reading the server config (including API keys) and arbitrary file read: https://xbow.com/blog/xbow-scoold-vuln/
- The first post about our HackerOne findings, an XSS in Palo Alto Networks GlobalProtect VPN portal used by a bunch of companies: https://xbow.com/blog/xbow-globalprotect-xss/
boston_clone · 2026-05-22
you would likely be quite interested in the more quantitative writeup from a real research team ! it’s linked about midway in to the article - similar functionally can be reached, yes, but not always and never with fewer tokens than what mythos requires.
https://xbow.com/blog/mythos-offensive-security-xbow-evaluation
meander_water · 2026-04-07
I think this is a largely inflated PR stunt.
Opus 4.6 was already capable of finding 0days and chaining together vulns to create exploits. See [0] and [1].
[0] https://www.csoonline.com/article/4153288/vim-and-gnu-emacs-claude-cod…
[1] https://xbow.com/blog/top-1-how-xbow-did-it
doomerhunter · 2026-01-19
Both are true, the difference is the skill level of the people who use / create programs to coordinate LLMs to generate those reports.
The AI slop you see on curl's bug bounty program[1] (mostly) comes from people who are not hackers in the first place.
In the contrary persons like the author are obviously skilled in security research and will definitely send valid bugs.
Same can be said for people in my space who do build LLM-driven exploit development. In the US Xbow hired quite some skilled researchers [2] had some promising development for instance.
[1] https://hackerone.com/curl/hacktivity
[2] https://xbow.com/about
thethimble · 2025-10-11
There is a related idea called "alloying" where the 2-4 candidate solutions are pursued in parallel with different models, yielding better results vs any single model. Very interesting ideas.
https://xbow.com/blog/alloy-agents