CVE-2021-47923

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-10. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

OpenCart 3.0.3.8 contains a session fixation vulnerability that allows attackers to hijack user sessions by injecting arbitrary values into the OCSESSID cookie. Attackers can set malicious OCSESSID cookie values that the server accepts and maintains, enabling session takeover and unauthorized access to user accounts.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
34.6%
KEV
Not listed

Published

May 10, 2026

Last Modified

May 12, 2026

Advisory Details (2)

Auto-updated May 10, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

OpenCart 3.0.3.8 Session Fixation via OCSESSID Cookie | Advisories | VulnCheck

https://www.vulncheck.com/advisories/opencart-session-fixation-via-ocsessid-cookie
generic🟡 PoC Available

opencart 3.0.3.8 - Sessjion Injection - PHP webapps Exploit

https://www.exploit-db.com/exploits/50555

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 52× 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 235 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-47923?
CVE-2021-47923 is a critical vulnerability published on May 10, 2026. OpenCart 3.0.3.8 contains a session fixation vulnerability that allows attackers to hijack user sessions by injecting arbitrary values into the OCSESSID cookie. Attackers can set malicious OCSESSID cookie values that the server accepts and maintains, enabling session takeover and unauthorized…
When was CVE-2021-47923 disclosed?
CVE-2021-47923 was first published in the National Vulnerability Database on May 10, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47923 actively exploited?
CVE-2021-47923 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47923?
CVE-2021-47923 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-47923?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47923, 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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