Since Fedora moved from Pagure to Forgejo, I finally had an incentive to take a good look at Forgejo’s security posture. The results aren’t pretty to be honest: SSRF in a lot of places, no CSP/Truste-Types, a bit of ghetto templating in javascript, cryptographic malpractices, overlooks in the authentication mechanisms (OAuth2, OTP, sessions/access handling, post-compromission recovery, …), a bunch of low-hanging DoS, information leak all over the place, various TOCTOU, … All in all, it took me one evening after work to find a good amount of vulnerabilities (adding to the one I got from looking at gitea at some point in the past), and chain them to obtain a full-blown RCE, secrets leaks, persistent account access, OAuth2 privesc, …

Fortunately (or unfortunately depending who you’re asking), the exploit relies on
open registration, and on a configuration option set to a non-default value
(which is the case on some instances I’ve looked at, so nothing exotic). This
means that the selling value is pretty low/nonexistent.
I could disclose the bugs to Forgejo, they even have a Security
Policy,
with a lot of `MUST`/ `MUST NOT` about what I should do should I decide to go
this way. But given the sorry state of the codebase, I’m pretty sure I could
spend another evening and find another chain.

I discussed the conundrum with a friend of mine, and was told to put my money where my mouth is, and just go with carrot disclosure:

> Carrot Disclosure, dangling a metaphorical carrot in front of the vendor to incentivise change. The main idea is to only publish the (redacted) output of the exploit for a critical vulnerability, to showcase that the software is exploitable. Now the vendor has two choices: either perform a holistic audit of its software, fixing as many issues as possible in the hope of fixing the showcased vulnerability; or losing users who might not be happy running a known-vulnerable software. Users of this disclosure model are of course called Bugs Bunnies.

So without further ado:

“`
$ python3 ./poc/chain_alpha.py –target http://127.0.0.1:3000 > out.txt $ grep Backdoor out.txt [+] Backdoor admin created: svc_ljeopgid / dukecepapsygiqks!A1 $ tail -n17 out.txt ================================================================ [+] COMMAND EXECUTION CONFIRMED! ================================================================ Server-side hook output (received via git push stderr): remote: ========================================== remote: FORGEJO RCE PoC – Command Execution Proof remote: ========================================== remote: hostname: chernabog remote: uid: uid=1000(jvoisin) gid=1000(jvoisin) groups=1000(jvoisin),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 remote: date: Tue Apr 28 19:16:59 UTC 2026 remote: proof: chernabog remote: ========================================== ================================================================ $ sha256 ./poc/chain_alpha.py c10d28a5ff74646683953874b035ca6ba56742db2f95198b54e561523e1880d7 ./poc/chain_alpha.py $ ls -l ./poc total 140 -rw-r–r–. 1 jvoisin jvoisin 23530 Apr 28 21:18 chain_alpha.py -rw-r–r–. 1 jvoisin jvoisin 6382 Apr 28 01:14 chain_beta.py -rw-r–r–. 1 jvoisin jvoisin 11410 Apr 28 21:54 chain_gamma.py -rw-r–r–. 1 jvoisin jvoisin 10334 Apr 28 22:20 leak_secrets.py -rw-r–r–. 1 jvoisin jvoisin 9171 Apr 28 23:15 merge.py -rw-r–r–. 1 jvoisin jvoisin 83861 Apr 27 23:59 NOTES.md $
“`