CVE-2026-82876

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-31. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

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

Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
53(Track*)
EG Risk 53/100SSVC: 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
Severity82% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Aug 31, 2026
No patch confirmed yet.
generic

Phison PS3111-S11 Controller Firmware Signature Verification Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-signature-verification-bypass
generic

GitHub - trulycrisp/psychite: Phison S11/PS3111 firmware tools · GitHub

https://github.com/trulycrisp/psychite
generic

Drive Firmware Security - Phison S11 - Truly Crisp

https://trulycrisp.github.io/drivefirmware/phison_s11/

Vendor Advisories for CVE-2026-82876(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 72× 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.

  1. 2026-09-19 17:45 UTCEG score recompute
  2. 2026-09-19 17:45 UTCGHSA enrichment
  3. 2026-09-19 06:31 UTCGHSA enrichment
  4. 2026-09-18 19:16 UTCGHSA enrichment
  5. 2026-09-18 08:02 UTCGHSA enrichment
  6. 2026-09-17 20:48 UTCEG score recompute
  7. 2026-09-17 20:48 UTCGHSA enrichment
  8. 2026-09-17 06:01 UTCGHSA enrichment
  9. 2026-09-16 18:45 UTCEG score recompute
  10. 2026-09-16 18:45 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 07:04 UTCEG score recompute
  13. 2026-09-16 07:04 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 19:50 UTCGHSA enrichment
  16. 2026-09-15 08:34 UTCGHSA enrichment
  17. 2026-09-14 21:20 UTCGHSA enrichment
  18. 2026-09-14 10:03 UTCGHSA enrichment
  19. 2026-09-13 22:41 UTCEG score recompute
  20. 2026-09-13 22:41 UTCGHSA enrichment
  21. 2026-09-13 11:27 UTCGHSA enrichment
  22. 2026-09-13 00:13 UTCGHSA enrichment
  23. 2026-09-12 12:58 UTCGHSA enrichment
  24. 2026-09-12 01:44 UTCEG score recompute
  25. 2026-09-12 01:44 UTCGHSA enrichment
Show 47 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-11 14:30 UTCEG score recompute
  4. 2026-09-11 14:30 UTCGHSA enrichment
  5. 2026-09-11 03:16 UTCGHSA enrichment
  6. 2026-09-10 16:02 UTCGHSA enrichment
  7. 2026-09-10 11:40 UTCEG score recompute
  8. 2026-09-10 11:40 UTCGHSA enrichment
  9. 2026-09-09 23:44 UTCGHSA enrichment
  10. 2026-09-09 10:45 UTCGHSA enrichment
  11. 2026-09-08 23:30 UTCEG score recompute
  12. 2026-09-08 23:30 UTCGHSA enrichment
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-08 06:34 UTCGHSA enrichment
  15. 2026-09-07 19:19 UTCGHSA enrichment
  16. 2026-09-07 08:04 UTCGHSA enrichment
  17. 2026-09-06 20:49 UTCEG score recompute
  18. 2026-09-06 20:49 UTCGHSA enrichment
  19. 2026-09-06 13:48 UTCEPSS rescore
  20. 2026-09-06 09:35 UTCGHSA enrichment
  21. 2026-09-05 22:21 UTCEG score recompute
  22. 2026-09-05 22:20 UTCGHSA enrichment
  23. 2026-09-05 15:31 UTCEPSS rescore
  24. 2026-09-05 11:07 UTCGHSA enrichment
  25. 2026-09-04 23:50 UTCGHSA enrichment
  26. 2026-09-04 12:36 UTCEG score recompute
  27. 2026-09-04 12:36 UTCGHSA enrichment
  28. 2026-09-04 05:07 UTCEPSS rescore
  29. 2026-09-04 01:22 UTCGHSA enrichment
  30. 2026-09-03 14:07 UTCGHSA enrichment
  31. 2026-09-03 02:50 UTCEG score recompute
  32. 2026-09-03 02:50 UTCGHSA enrichment
  33. 2026-09-02 15:34 UTCEG score recompute
  34. 2026-09-02 15:34 UTCGHSA enrichment
  35. 2026-09-02 15:09 UTCEG score recompute
  36. 2026-09-02 15:09 UTCGHSA enrichment
  37. 2026-09-02 14:12 UTCEPSS rescore
  38. 2026-09-02 08:24 UTCGHSA enrichment
  39. 2026-09-01 21:10 UTCEG score recompute
  40. 2026-09-01 21:10 UTCGHSA enrichment
  41. 2026-09-01 13:54 UTCEPSS rescore
  42. 2026-09-01 09:55 UTCGHSA enrichment
  43. 2026-08-31 22:40 UTCEG score recompute
  44. 2026-08-31 22:40 UTCGHSA enrichment
  45. 2026-08-31 11:25 UTCEG score recompute
  46. 2026-08-31 11:02 UTCEG score recompute
  47. 2026-08-31 10:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82876?
CVE-2026-82876 is a high vulnerability published on August 31, 2026. Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the…
When was CVE-2026-82876 disclosed?
CVE-2026-82876 was first published in the National Vulnerability Database on August 31, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82876 actively exploited?
CVE-2026-82876 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.6% of all scored CVEs.
What is the CVSS score of CVE-2026-82876?
CVE-2026-82876 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-82876?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82876, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82876

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