CVE-2022-40958

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 6.5 from GitHub Security Advisory published 2022-12-22. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

By injecting a cookie with certain special characters, an attacker on a shared subdomain which is not a secure context could set and thus overwrite cookies from a secure context, leading to session fixation and other attacks. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
30
EG Risk 30/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.1%
EPSS %ILE
65th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 22, 2022

Last Modified

April 15, 2025

References (4)

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntufirefox-locale-ast (105.0+build2-0ubuntu0.20.04.1) @ focal2026-05-25ubuntu
ubuntuthunderbird-locale-id (1:102.4.2+build2-0ubuntu0.22.10.1) @ kinetic2026-05-25ubuntu
redhatfirefox-0:102.3.0-6.el8_22022-09-26redhat
redhatthunderbird-0:102.3.0-3.el8_22022-09-26redhat
redhatfirefox-0:102.3.0-6.el8_42022-09-26redhat
redhatfirefox-0:102.3.0-6.el7_92022-09-26redhat
redhatthunderbird-0:102.3.0-3.el8_42022-09-26redhat
redhatfirefox-0:102.3.0-6.el9_02022-09-26redhat
redhatthunderbird-0:102.3.0-3.el9_02022-09-26redhat
redhatthunderbird-0:102.3.0-3.el7_92022-09-26redhat
redhatfirefox-0:102.3.0-6.el8_62022-09-26redhat
redhatthunderbird-0:102.3.0-3.el8_62022-09-26redhat
redhatfirefox-0:102.3.0-6.el8_12022-09-26redhat
redhatthunderbird-0:102.3.0-3.el8_12022-09-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(10 across 5 ecosystems)
Debian:10(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (170 versions)
  • every version up to 102.3.0esr-1~deb10u2: fixed in 102.3.0esr-1~deb10u2
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (208 versions)
  • every version up to 1:102.3.0-1~deb10u1: fixed in 1:102.3.0-1~deb10u1
—
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (68 versions)
  • every version up to 102.3.0esr-1~deb11u1: fixed in 102.3.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (85 versions)
  • every version up to 1:102.3.0-1~deb11u1: fixed in 1:102.3.0-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 102.3.0esr-1: fixed in 102.3.0esr-1
—
thunderbird—
  • every version up to 1:102.3.0-1: fixed in 1:102.3.0-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 102.3.0esr-1: fixed in 102.3.0esr-1
—
thunderbird—
  • every version up to 1:102.3.0-1: fixed in 1:102.3.0-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 102.3.0esr-1: fixed in 102.3.0esr-1
—
thunderbird—
  • every version up to 1:102.3.0-1: fixed in 1:102.3.0-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(14)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 29× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 89 of 177 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 11 repeat rows among the latest 100 are merged into the row they repeat. The 88 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:29 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  2. 2026-10-12 18:48 UTCEG score recompute
  3. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  4. 2026-10-11 23:11 UTCEG score recompute
  5. 2026-10-11 13:44 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  6. 2026-10-10 19:57 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  7. 2026-10-09 20:04 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  8. 2026-10-08 17:05 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  9. 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  10. 2026-10-06 15:14 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  11. 2026-10-05 17:40 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  12. 2026-10-04 23:19 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  13. 2026-10-03 14:23 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  14. 2026-10-02 16:23 UTCEPSS rescoreEPSS 1.1% · 65th percentile
  15. 2026-10-01 19:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-09-30 16:05 UTCEG score recompute
  17. 2026-09-30 15:01 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  18. 2026-09-29 15:16 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-09-28 13:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-09-27 13:42 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-09-26 15:55 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  22. 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  23. 2026-09-24 02:06 UTCOSV refresh
  24. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-09-20 20:13 UTCEPSS rescoreEPSS 1.1% · 64th percentile
Show 64 more
  1. 2026-09-19 15:38 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  3. 2026-09-16 05:10 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  4. 2026-09-15 03:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  5. 2026-09-13 16:44 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  6. 2026-09-12 14:57 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  7. 2026-09-11 14:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  8. 2026-09-11 09:33 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  9. 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  10. 2026-09-07 15:58 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  11. 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  12. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  13. 2026-09-04 19:54 UTCOSV refresh
  14. 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  15. 2026-09-04 05:04 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  16. 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  17. 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  18. 2026-08-30 19:14 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  19. 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  20. 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  21. 2026-08-27 14:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  22. 2026-08-26 14:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  23. 2026-08-25 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  24. 2026-08-24 14:13 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  25. 2026-08-23 00:17 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  26. 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  27. 2026-08-20 22:53 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  28. 2026-08-19 17:01 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  29. 2026-08-18 13:45 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  30. 2026-08-18 06:52 UTCOSV refresh
  31. 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  32. 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  33. 2026-08-16 02:12 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  34. 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  35. 2026-08-13 21:58 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  36. 2026-08-12 13:48 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  37. 2026-08-11 13:39 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  38. 2026-08-09 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  39. 2026-08-08 16:34 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  40. 2026-08-07 16:24 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  41. 2026-08-06 13:44 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  42. 2026-08-05 19:15 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  43. 2026-08-04 15:07 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  44. 2026-08-04 10:35 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  45. 2026-08-03 10:33 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  46. 2026-08-03 01:57 UTCOSV refresh
  47. 2026-08-02 02:24 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  48. 2026-08-01 04:13 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  49. 2026-07-30 16:25 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  50. 2026-07-30 01:28 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  51. 2026-07-28 15:34 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  52. 2026-07-26 14:52 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  53. 2026-07-25 14:15 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  54. 2026-07-24 14:15 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  55. 2026-07-23 14:16 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  56. 2026-07-23 02:13 UTCEG score recompute
  57. 2026-07-22 23:01 UTCEG score recompute
  58. 2026-07-22 14:06 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  59. 2026-07-21 15:23 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  60. 2026-07-20 17:05 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  61. 2026-07-19 14:29 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  62. 2026-07-19 02:27 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  63. 2026-07-18 10:03 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  64. 2026-07-16 11:19 UTCOSV refresh

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Frequently asked(5)

What is CVE-2022-40958?
CVE-2022-40958 is a medium-severity vulnerability; its CVE record was published on December 22, 2022. By injecting a cookie with certain special characters, an attacker on a shared subdomain which is not a secure context could set and thus overwrite cookies from a secure context, leading to session fixation and other attacks. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and…
When was the CVE record for CVE-2022-40958 published?
The CVE record for CVE-2022-40958 was published on December 22, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 15, 2025; the record at its source may have been updated since.
Is CVE-2022-40958 actively exploited?
CVE-2022-40958 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-40958?
CVE-2022-40958 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2022-40958?
A fix for CVE-2022-40958 is available: update to the fixed version the vendor names in its advisory.

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