CVE-2026-54364

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-07-30. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
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: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

CentreStack before 17.4 contains a session variable injection vulnerability that allows unauthenticated attackers to inject arbitrary session variables by embedding newline and tab characters into a crafted AccountName parameter posted to the SelectProvider.aspx endpoint. Attackers can exploit the lack of input sanitization in the custom session serialization format to inject a resellerid session variable, bypassing the IsValidRSession authentication check and gaining unauthorized access to management pages.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

July 30, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

CentreStack < 17.4 Session Injection via SelectProvider.aspx | Advisories | VulnCheck

https://www.vulncheck.com/advisories/centrestack-session-injection-via-selectprovider-aspx
generic

CentreStack: Grow Your MSP with Your Branded File Solution

https://www.centrestack.com/

Vendor Advisories for CVE-2026-54364(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 18× in last 7d / 78× 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. 2026-08-26 07:10 UTCEG score recompute
  2. 2026-08-26 07:10 UTCGHSA enrichment
  3. 2026-08-25 13:49 UTCEPSS rescore
  4. 2026-08-25 05:47 UTCEG score recompute
  5. 2026-08-25 05:47 UTCGHSA enrichment
  6. 2026-08-24 04:32 UTCGHSA enrichment
  7. 2026-08-23 03:16 UTCEG score recompute
  8. 2026-08-23 03:16 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 02:01 UTCEG score recompute
  11. 2026-08-22 02:01 UTCGHSA enrichment
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 00:45 UTCEG score recompute
  14. 2026-08-21 00:45 UTCGHSA enrichment
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-19 23:31 UTCEG score recompute
  17. 2026-08-19 23:31 UTCGHSA enrichment
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 22:15 UTCEG score recompute
  20. 2026-08-18 22:15 UTCGHSA enrichment
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-17 20:57 UTCEG score recompute
  23. 2026-08-17 20:57 UTCGHSA enrichment
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-16 19:42 UTCEG score recompute
Show 53 more
  1. 2026-08-16 19:42 UTCGHSA enrichment
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 02:14 UTCEPSS rescore
  4. 2026-08-15 18:27 UTCEG score recompute
  5. 2026-08-15 18:27 UTCGHSA enrichment
  6. 2026-08-15 01:30 UTCEPSS rescore
  7. 2026-08-14 17:12 UTCEG score recompute
  8. 2026-08-14 17:12 UTCGHSA enrichment
  9. 2026-08-14 10:19 UTCEG score recompute
  10. 2026-08-14 10:19 UTCGHSA enrichment
  11. 2026-08-13 22:00 UTCEPSS rescore
  12. 2026-08-13 09:05 UTCEG score recompute
  13. 2026-08-13 09:05 UTCGHSA enrichment
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-12 07:50 UTCEG score recompute
  16. 2026-08-12 07:50 UTCGHSA enrichment
  17. 2026-08-11 06:35 UTCEG score recompute
  18. 2026-08-11 06:35 UTCGHSA enrichment
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-10 05:20 UTCEG score recompute
  21. 2026-08-10 05:20 UTCGHSA enrichment
  22. 2026-08-09 13:46 UTCEPSS rescore
  23. 2026-08-09 04:06 UTCEG score recompute
  24. 2026-08-09 04:06 UTCGHSA enrichment
  25. 2026-08-08 16:37 UTCEPSS rescore
  26. 2026-08-08 02:51 UTCEG score recompute
  27. 2026-08-08 02:51 UTCGHSA enrichment
  28. 2026-08-07 01:36 UTCEG score recompute
  29. 2026-08-07 01:36 UTCGHSA enrichment
  30. 2026-08-06 13:47 UTCEPSS rescore
  31. 2026-08-06 00:22 UTCEG score recompute
  32. 2026-08-06 00:22 UTCGHSA enrichment
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-04 23:07 UTCEG score recompute
  35. 2026-08-04 23:07 UTCGHSA enrichment
  36. 2026-08-04 15:10 UTCEPSS rescore
  37. 2026-08-04 10:39 UTCEPSS rescore
  38. 2026-08-03 21:52 UTCEG score recompute
  39. 2026-08-03 21:52 UTCGHSA enrichment
  40. 2026-08-03 10:36 UTCEPSS rescore
  41. 2026-08-02 20:38 UTCEG score recompute
  42. 2026-08-02 20:38 UTCGHSA enrichment
  43. 2026-08-02 02:27 UTCEPSS rescore
  44. 2026-08-01 19:23 UTCEG score recompute
  45. 2026-08-01 19:23 UTCGHSA enrichment
  46. 2026-08-01 04:16 UTCEPSS rescore
  47. 2026-07-31 18:08 UTCGHSA enrichment
  48. 2026-07-30 16:53 UTCEG score recompute
  49. 2026-07-30 16:53 UTCGHSA enrichment
  50. 2026-07-30 14:29 UTCEG score recompute
  51. 2026-07-30 13:21 UTCEG score recompute
  52. 2026-07-30 12:47 UTCEG score recompute
  53. 2026-07-30 12:46 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-54364?
CVE-2026-54364 is a medium vulnerability published on July 30, 2026. CentreStack before 17.4 contains a session variable injection vulnerability that allows unauthenticated attackers to inject arbitrary session variables by embedding newline and tab characters into a crafted AccountName parameter posted to the SelectProvider.aspx endpoint. Attackers can exploit the…
When was CVE-2026-54364 disclosed?
CVE-2026-54364 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54364 actively exploited?
CVE-2026-54364 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 83.6% of all scored CVEs.
What is the CVSS score of CVE-2026-54364?
CVE-2026-54364 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-54364?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54364, 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-2026-54364

Explore →

Is Your Infrastructure Affected by CVE-2026-54364?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs