CVE-2020-26975

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

When a malicious application installed on the user's device broadcast an Intent to Firefox for Android, arbitrary headers could have been specified, leading to attacks such as abusing ambient authority or session fixation. This was resolved by only allowing certain safe-listed headers. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

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
Severity65% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

January 7, 2021

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox 84 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-54/
generic🟡 PoC Available

1661071 - (CVE-2020-26975) Missing restricted header check in Browser.EXTRA_HEADERS

https://bugzilla.mozilla.org/show_bug.cgi?id=1661071

Vendor Advisories for CVE-2020-26975(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

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

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 117 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-19 15:48 UTCEG score recompute
  4. 2026-08-19 15:48 UTCGHSA enrichment
  5. 2026-08-18 13:44 UTCEPSS rescore
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  7. 2026-08-16 14:52 UTCEPSS rescore
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  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:52 UTCEG score recompute
  4. 2026-07-22 22:38 UTCEG score recompute
  5. 2026-07-22 14:05 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
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  23. 2026-07-11 08:25 UTCEPSS rescore
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  25. 2026-07-09 19:07 UTCEPSS rescore
  26. 2026-07-08 15:12 UTCEPSS rescore
  27. 2026-07-07 13:43 UTCEPSS rescore
  28. 2026-07-06 16:25 UTCEPSS rescore
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  42. 2026-06-23 21:31 UTCEPSS rescore
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  46. 2026-06-21 14:54 UTCEPSS rescore
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  48. 2026-06-21 01:57 UTCEPSS rescore
  49. 2026-06-19 19:24 UTCEPSS rescore
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  51. 2026-06-18 17:50 UTCEPSS rescore
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  74. 2026-06-02 20:11 UTCEPSS rescore
  75. 2026-06-02 20:11 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-26975?
CVE-2020-26975 is a medium vulnerability published on January 7, 2021. When a malicious application installed on the user's device broadcast an Intent to Firefox for Android, arbitrary headers could have been specified, leading to attacks such as abusing ambient authority or session fixation. This was resolved by only allowing certain safe-listed headers. Note: This…
When was CVE-2020-26975 disclosed?
CVE-2020-26975 was first published in the National Vulnerability Database on January 7, 2021, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-26975 actively exploited?
CVE-2020-26975 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 44.3% of all scored CVEs.
What is the CVSS score of CVE-2020-26975?
CVE-2020-26975 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2020-26975?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-26975, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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