CVE-2018-5131
Under certain circumstances the "fetch()" API can return transient local copies of resources that were sent with a "no-store" or…
- 5.9MediumCVSS base score
- 2.2%Exploitation in 30 daysEPSS · top 17% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Under certain circumstances the "fetch()" API can return transient local copies of resources that were sent with a "no-store" or "no-cache" cache header instead of downloading a copy from the network as it should. This can result in previously stored, locally cached data of a website being accessible to users if they share a common profile while browsing. This vulnerability affects Firefox ESR < 52.7 and Firefox < 59.
Timeline
ID reserved
By mozilla
- 5 months later
· 5 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 2.2% · top 17% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Affected products
- affected unspecified – < 52.7
- affected unspecified – < 59
References
11
- DSA-4139 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- GLSA-201810-01 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- 103388 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- RHSA-2018:0527 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [debian-lts-announce] 20180315 [SECURITY] [DLA 1308-1] firefox-esr security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.mozilla.org/security/advisories/mfsa2018-07/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2018:0526 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1440775 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1040514 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- USN-3596-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://www.mozilla.org/security/advisories/mfsa2018-06/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-16917 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2018-5131)Record last updated .