CVE-2026-76243 stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth
Attackers can perform read, write, and federation operations with anonymous identity when authentication is disabled on non-loopback deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76243?
CVE-2026-76243 is a critical authentication bypass vulnerability in eidetic-labs stigmem, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
Weakness: CWE-285
Which versions are affected by CVE-2026-76243?
2 open source packages ship an affected version, including stigmem-node.
| Package | Affected | Fixed in |
|---|---|---|
stigmem-node PyPI | All versions | 0.9.0a2 |
stigmem-node PyPI | All versions | 0.9.0a2 |
How do I fix CVE-2026-76243?
Upgrade stigmem-node to 0.9.0a2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-76243 being exploited?
There is no known exploitation of CVE-2026-76243 in the wild and no public exploit code.
Sources
Also known as GHSA-fp6w-8wpg-74g5, GHSA-rqm4-4g3h-95wm.