CVE-2026-9507

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 66% 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: cna:incibe, epss
Trending — 3 sources updated this week
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.1Exploit: None knownExposed: 0

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

A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login.

The issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim’s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated.

CVSS v3
5.1
EG Score
5.1(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

Session fixation vulnerability in Enhancesoft's osTicket | INCIBE-CERT | INCIBE

https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket

Vendor Advisories for CVE-2026-9507(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 9× in last 7d / 39× 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 179 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-16 14:09 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 03:32 UTCEG score recompute
  7. 2026-09-14 03:32 UTCGHSA enrichment
  8. 2026-09-13 16:48 UTCEPSS rescore
  9. 2026-09-12 15:02 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 09:38 UTCEPSS rescore
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-06 13:48 UTCEPSS rescore
  15. 2026-09-05 15:31 UTCEPSS rescore
  16. 2026-09-04 05:07 UTCEPSS rescore
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-09-01 04:40 UTCEPSS rescore
  20. 2026-08-30 22:49 UTCEG score recompute
  21. 2026-08-30 22:49 UTCGHSA enrichment
  22. 2026-08-30 19:18 UTCEPSS rescore
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:42 UTCEPSS rescore
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:47 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-24 23:25 UTCEG score recompute
  4. 2026-08-24 23:25 UTCGHSA enrichment
  5. 2026-08-24 14:18 UTCEPSS rescore
  6. 2026-08-23 09:27 UTCEG score recompute
  7. 2026-08-23 09:27 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-21 11:56 UTCEG score recompute
  11. 2026-08-21 11:56 UTCGHSA enrichment
  12. 2026-08-20 22:56 UTCEPSS rescore
  13. 2026-08-20 12:29 UTCEG score recompute
  14. 2026-08-20 12:29 UTCGHSA enrichment
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-19 13:08 UTCEG score recompute
  17. 2026-08-19 13:08 UTCGHSA enrichment
  18. 2026-08-18 13:49 UTCEPSS rescore
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 09:22 UTCEG score recompute
  21. 2026-08-17 09:22 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 10:14 UTCEG score recompute
  24. 2026-08-16 10:14 UTCGHSA enrichment
  25. 2026-08-16 02:15 UTCEPSS rescore
  26. 2026-08-15 11:06 UTCEG score recompute
  27. 2026-08-15 11:06 UTCGHSA enrichment
  28. 2026-08-15 01:31 UTCEPSS rescore
  29. 2026-08-14 11:57 UTCEG score recompute
  30. 2026-08-14 11:57 UTCGHSA enrichment
  31. 2026-08-13 22:00 UTCEPSS rescore
  32. 2026-08-13 12:49 UTCEG score recompute
  33. 2026-08-13 12:49 UTCGHSA enrichment
  34. 2026-08-12 13:51 UTCEPSS rescore
  35. 2026-08-12 13:22 UTCGHSA enrichment
  36. 2026-08-11 14:14 UTCEG score recompute
  37. 2026-08-11 14:13 UTCGHSA enrichment
  38. 2026-08-11 13:43 UTCEPSS rescore
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 15:05 UTCGHSA enrichment
  41. 2026-08-09 15:55 UTCEG score recompute
  42. 2026-08-09 15:55 UTCGHSA enrichment
  43. 2026-08-09 13:47 UTCEPSS rescore
  44. 2026-08-08 16:47 UTCEG score recompute
  45. 2026-08-08 16:47 UTCGHSA enrichment
  46. 2026-08-08 16:37 UTCEPSS rescore
  47. 2026-08-07 17:38 UTCEG score recompute
  48. 2026-08-07 17:38 UTCGHSA enrichment
  49. 2026-08-07 16:30 UTCEPSS rescore
  50. 2026-08-06 18:30 UTCEG score recompute
  51. 2026-08-06 18:30 UTCGHSA enrichment
  52. 2026-08-06 13:47 UTCEPSS rescore
  53. 2026-08-05 19:22 UTCEG score recompute
  54. 2026-08-05 19:22 UTCGHSA enrichment
  55. 2026-08-05 19:17 UTCEPSS rescore
  56. 2026-08-04 15:37 UTCEG score recompute
  57. 2026-08-04 15:37 UTCGHSA enrichment
  58. 2026-08-04 15:10 UTCEPSS rescore
  59. 2026-08-04 10:39 UTCEPSS rescore
  60. 2026-08-03 10:36 UTCEPSS rescore
  61. 2026-08-03 08:54 UTCGHSA enrichment
  62. 2026-08-02 07:30 UTCEG score recompute
  63. 2026-08-02 07:30 UTCGHSA enrichment
  64. 2026-08-02 02:27 UTCEPSS rescore
  65. 2026-08-01 08:22 UTCEG score recompute
  66. 2026-08-01 08:22 UTCGHSA enrichment
  67. 2026-08-01 04:16 UTCEPSS rescore
  68. 2026-07-31 04:25 UTCEG score recompute
  69. 2026-07-31 04:25 UTCGHSA enrichment
  70. 2026-07-30 16:28 UTCEPSS rescore
  71. 2026-07-30 04:22 UTCEG score recompute
  72. 2026-07-30 04:22 UTCGHSA enrichment
  73. 2026-07-30 01:30 UTCEPSS rescore
  74. 2026-07-29 03:03 UTCEG score recompute
  75. 2026-07-29 03:03 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-9507?
CVE-2026-9507 is a medium vulnerability published on June 16, 2026. A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login. The issue lies in the fact that the application does not invalidate the…
When was CVE-2026-9507 disclosed?
CVE-2026-9507 was first published in the National Vulnerability Database on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9507 actively exploited?
CVE-2026-9507 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 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-9507?
CVE-2026-9507 has a CVSS v4.0 base score of 5.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-9507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9507, 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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