Mozilla: Fetch API improperly returns cached copies of no-store/no-cache resources (MFSA 2018-07)
Published Jun 11, 2018
6.1
MEDIUMCVSS 3.0
EPSS 2.29%
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.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<59
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.7
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
|
Configuration 1
- 7.0
- 8.0
- 9.0
Configuration 4
- 6.0
- 7.0
- 6.0
- 7.0
- 7.4
- 7.4
- 7.5
- 6.0
- 7.0
Configuration 5
- 14.04
- 16.04
- 17.10
No data.
Red Hat Enterprise Linux 6
firefox-0:52.7.0-1.el6_9
Fixed · RHSA-2018:0526
Red Hat Enterprise Linux 7
firefox-0:52.7.0-1.el7_4
Fixed · RHSA-2018:0527
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox-0:52.7.0-1.el6_9 | Fixed | RHSA-2018:0526 |
| Red Hat Enterprise Linux 7 | firefox-0:52.7.0-1.el7_4 | Fixed | RHSA-2018:0527 |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.29% (0.02293) | 82.65th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.32% (0.02323) | 81.18th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.47% (0.01474) | 79.17th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.85% (0.02851) | 77.05th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.50% (0.01503) | 79.85th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00155) | 53.19th | v3 (v2023.03.01) |
| Jan 5, 2024 | 0.22% (0.00217) | 59.66th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.28% (0.00277) | 64.68th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.54% (0.00536) | 74.65th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.65% (0.00651) | 76.80th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.63% (0.00633) | 75.81th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.63% (0.02627) | 55.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.63% (0.02627) | 0.00th | v1 |
References (16)
- http://www.securityfocus.com/bid/103388 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040514 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:0526 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:0527 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-5131 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1440775 x_refsource_CONFIRMIssue TrackingPermissions RequiredThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1555131 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2018/03/msg00010.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-5131
- https://security.gentoo.org/glsa/201810-01 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3596-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-5131
- https://www.debian.org/security/2018/dsa-4139 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2018-07/#CVE-2018-5131
- https://www.mozilla.org/security/advisories/mfsa2018-06/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-07/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.