CVE-2026-123870
[Eclipse CSI - otterdog] Unauthenticated remote code execution via eval() on format-string-injected webhook body when GITHUB_WEBHOOK_SECRET is unset
Description
The otterdog webapp evaluates a format-string built from the incoming GitHub webhook JSON body using Python's eval(). When the GITHUB_WEBHOOK_SECRET configuration value is unset or empty (the code default is None), the HMAC signature check is skipped entirely, allowing an unauthenticated network client to reach the eval() sink with attacker-controlled input and execute arbitrary Python on the webapp host.
INFO
Published Date :
Nov. 9, 2026, 9 a.m.
Last Modified :
Nov. 9, 2026, 9 a.m.
Remotely Exploit :
Yes !
Source :
eclipse
Affected Products
The following products are affected by CVE-2026-123870
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | e51fbebd-6053-4e49-959f-1b94eeb69a2c |
Solution
- Ensure GITHUB_WEBHOOK_SECRET is configured.
- Validate incoming webhook HMAC signatures.
- Avoid using eval() with user-controlled input.
- Sanitize all input before processing.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-123870 vulnerability anywhere in the article.