CVE-2026-52885

MEDIUMNVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

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

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of the on-disk shortcuts.xml at the moment a user command fires (Time-of-Check). However, the command payload is taken from the in-memory _userCommands vector, which is populated at application startup and never re-synchronized with the on-disk file (Time-of-Use). Swapping shortcuts.xml between startup and command execution causes the HMAC check to validate a clean file while a malicious command runs. An attacker with write access to shortcuts.xml places a malicious version on disk before launch, then immediately restores the legitimate file. The HMAC check at execution time validates the restored legitimate file (check passes), while the malicious payload executes from memory. This vulnerability is fixed in 8.9.6.4.

CVSS v3
6.3
EG Score
6.3(medium)
EPSS
3.0%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

TOCTOU: HMAC Checks Disk, Executes from Memory · Advisory · notepad-plus-plus/notepad-plus-plus · GitHub

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-qm4c-qg8p-qfcr
github_commit

commit 4f7563c7c7f8 (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit 4f7563c7c7f8 — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/4f7563c7c7f8ffa0d795ec86a7777067c7d644b5

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 41× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-12 05:08 UTCEG score recompute
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-11 02:52 UTCEG score recompute
  6. 2026-07-10 00:36 UTCEG score recompute
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 22:12 UTCEG score recompute
  10. 2026-07-08 15:16 UTCEPSS rescore
  11. 2026-07-08 15:16 UTCEPSS rescore
  12. 2026-07-07 19:56 UTCEG score recompute
  13. 2026-07-07 13:46 UTCEPSS rescore
  14. 2026-07-07 13:46 UTCEPSS rescore
  15. 2026-07-06 17:39 UTCEG score recompute
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-06 02:23 UTCEPSS rescore
  20. 2026-07-05 15:23 UTCEG score recompute
  21. 2026-07-04 13:04 UTCEG score recompute
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-03 10:48 UTCEG score recompute
  24. 2026-07-02 08:28 UTCEG score recompute
  25. 2026-07-01 06:12 UTCEG score recompute
Show 16 more
  1. 2026-06-30 23:22 UTCEPSS rescore
  2. 2026-06-30 03:54 UTCEG score recompute▼ 1.20
  3. 2026-06-29 21:26 UTCNVD updateCVSS v3 → 6.3 · severity → MEDIUM
  4. 2026-06-29 16:44 UTCEG score recompute
  5. 2026-06-29 14:06 UTCEPSS rescore
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-29 05:33 UTCEG score recompute
  8. 2026-06-28 18:22 UTCEG score recompute
  9. 2026-06-28 14:07 UTCEPSS rescore
  10. 2026-06-28 07:12 UTCEG score recompute
  11. 2026-06-28 04:56 UTCEPSS rescore
  12. 2026-06-28 04:56 UTCEPSS rescore
  13. 2026-06-27 20:03 UTCEG score recompute
  14. 2026-06-27 08:53 UTCEG score recompute
  15. 2026-06-26 21:43 UTCEG score recompute
  16. 2026-06-26 21:42 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-52885?
CVE-2026-52885 is a medium vulnerability published on June 26, 2026. Notepad++ is a free and open-source source code editor. Prior to 8.9.6.4, NppCommands.cpp checks the HMAC of the on-disk shortcuts.xml at the moment a user command fires (Time-of-Check). However, the command payload is taken from the in-memory _userCommands vector, which is populated at application…
When was CVE-2026-52885 disclosed?
CVE-2026-52885 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52885 actively exploited?
CVE-2026-52885 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-52885?
CVE-2026-52885 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-52885?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52885, 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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