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
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 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)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

May 10, 2026

Last Modified

July 25, 2026

Advisory Details (2)

Auto-updated Jul 25, 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 13× in last 7d / 48× 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 243 total refreshes for this CVE.

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

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 July 25, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 65.3% of all scored CVEs.
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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