CVE-2026-52783

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). 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, secondary
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

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

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, OpenProject's Storages module writes the OneDrive/SharePoint userless OAuth access_token plaintext to Rails.cache under the deterministic key storage..httpx_access_token, repopulated continuously by an hourly cron and every userless-OAuth call site (see Write cadence). None of the three allowed cache backends (file_store, memcache, redis) encrypts at rest. An attacker with read access to the cache backend recovers the Azure-AD application-tier bearer with an anonymous get over the memcached binary protocol (or the equivalent against Redis). This vulnerability is fixed in 17.3.3 and 17.4.1.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
3.0%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
Patch available. Sources: github.
github Patch Available

Information Disclosure (cleartext storage of data) on localhost through memcached via Others "storage.<id>.httpx_access_token" leads to Sensitive Data Exposure · Advisory · opf/openproject · GitHub

https://github.com/opf/openproject/security/advisories/GHSA-h83w-5q5x-pq27

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 50× 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. 2026-07-11 13:11 UTCEG score recompute
  2. 2026-07-11 02:12 UTCEG score recompute
  3. 2026-07-10 15:14 UTCEG score recompute
  4. 2026-07-10 04:15 UTCEG score recompute
  5. 2026-07-09 19:10 UTCEPSS rescore
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-09 17:11 UTCEG score recompute
  8. 2026-07-09 06:13 UTCEG score recompute
  9. 2026-07-08 19:14 UTCEG score recompute
  10. 2026-07-08 15:16 UTCEPSS rescore
  11. 2026-07-08 15:16 UTCEPSS rescore
  12. 2026-07-08 08:13 UTCEG score recompute
  13. 2026-07-07 21:16 UTCEG score recompute
  14. 2026-07-07 13:46 UTCEPSS rescore
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-07 10:18 UTCEG score recompute
  17. 2026-07-06 23:10 UTCEG score recompute
  18. 2026-07-06 16:27 UTCEPSS rescore
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 12:12 UTCEG score recompute
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-06 01:12 UTCEG score recompute
  23. 2026-07-05 14:14 UTCEG score recompute
  24. 2026-07-05 03:16 UTCEG score recompute
  25. 2026-07-04 16:17 UTCEG score recompute
Show 25 more
  1. 2026-07-04 06:31 UTCEPSS rescore
  2. 2026-07-04 05:20 UTCEG score recompute
  3. 2026-07-03 18:21 UTCEG score recompute
  4. 2026-07-03 07:22 UTCEG score recompute
  5. 2026-07-02 20:24 UTCEG score recompute
  6. 2026-07-02 09:26 UTCEG score recompute
  7. 2026-07-01 22:28 UTCEG score recompute
  8. 2026-07-01 11:30 UTCEG score recompute
  9. 2026-07-01 00:33 UTCEG score recompute
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-30 13:34 UTCEG score recompute
  12. 2026-06-30 02:36 UTCEG score recompute
  13. 2026-06-29 15:38 UTCEG score recompute
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-29 04:39 UTCEG score recompute
  17. 2026-06-28 17:39 UTCEG score recompute
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 06:41 UTCEG score recompute
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 19:43 UTCEG score recompute
  23. 2026-06-27 08:43 UTCEG score recompute
  24. 2026-06-26 21:44 UTCEG score recompute
  25. 2026-06-26 21:42 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-52783?
CVE-2026-52783 is a high vulnerability published on June 26, 2026. OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, OpenProject's Storages module writes the OneDrive/SharePoint userless OAuth accesstoken plaintext to Rails.cache under the deterministic key storage.<id>.httpxaccesstoken, repopulated continuously by an…
When was CVE-2026-52783 disclosed?
CVE-2026-52783 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-2026-52783 actively exploited?
CVE-2026-52783 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-2026-52783?
CVE-2026-52783 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-52783?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52783, 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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