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
9.8EG
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
36%
KEV
Not listed

Published

May 10, 2026

Last Modified

July 25, 2026

Advisory Details (2)

Auto-updated Sep 12, 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 5× in last 7d / 31× 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 360 total refreshes for this CVE.

  1. 2026-09-15 03:06 UTCEPSS rescore
  2. 2026-09-12 14:57 UTCEPSS rescore
  3. 2026-09-11 14:49 UTCEPSS rescore
  4. 2026-09-11 09:33 UTCEPSS rescore
  5. 2026-09-08 21:57 UTCEPSS rescore
  6. 2026-09-07 15:58 UTCEPSS rescore
  7. 2026-09-06 13:45 UTCEPSS rescore
  8. 2026-09-05 15:25 UTCEPSS rescore
  9. 2026-09-04 13:57 UTCEPSS rescore
  10. 2026-09-04 05:03 UTCEPSS rescore
  11. 2026-09-02 14:09 UTCEPSS rescore
  12. 2026-09-01 13:51 UTCEPSS rescore
  13. 2026-08-30 19:14 UTCEPSS rescore
  14. 2026-08-30 01:19 UTCEPSS rescore
  15. 2026-08-28 21:38 UTCEPSS rescore
  16. 2026-08-27 14:22 UTCEPSS rescore
  17. 2026-08-26 14:43 UTCEPSS rescore
  18. 2026-08-25 13:46 UTCEPSS rescore
  19. 2026-08-24 14:13 UTCEPSS rescore
  20. 2026-08-23 18:47 UTCEG score recompute
  21. 2026-08-23 18:47 UTCGHSA enrichment
  22. 2026-08-21 23:46 UTCEPSS rescore
  23. 2026-08-20 22:52 UTCEPSS rescore
  24. 2026-08-19 17:01 UTCEPSS rescore
  25. 2026-08-18 13:45 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 13:44 UTCEPSS rescore
  2. 2026-08-17 11:21 UTCEG score recompute
  3. 2026-08-17 11:21 UTCGHSA enrichment
  4. 2026-08-16 14:53 UTCEPSS rescore
  5. 2026-08-16 11:59 UTCGHSA enrichment
  6. 2026-08-16 08:14 UTCGHSA enrichment
  7. 2026-08-16 04:29 UTCEG score recompute
  8. 2026-08-16 04:29 UTCGHSA enrichment
  9. 2026-08-16 02:11 UTCEPSS rescore
  10. 2026-08-15 01:35 UTCEG score recompute
  11. 2026-08-15 01:35 UTCGHSA enrichment
  12. 2026-08-15 01:27 UTCEPSS rescore
  13. 2026-08-14 21:51 UTCGHSA enrichment
  14. 2026-08-14 18:06 UTCGHSA enrichment
  15. 2026-08-14 14:21 UTCGHSA enrichment
  16. 2026-08-14 10:36 UTCGHSA enrichment
  17. 2026-08-14 06:49 UTCGHSA enrichment
  18. 2026-08-14 03:04 UTCEG score recompute
  19. 2026-08-14 03:04 UTCGHSA enrichment
  20. 2026-08-13 21:57 UTCEPSS rescore
  21. 2026-08-13 08:17 UTCGHSA enrichment
  22. 2026-08-13 03:54 UTCGHSA enrichment
  23. 2026-08-13 00:09 UTCGHSA enrichment
  24. 2026-08-12 20:24 UTCGHSA enrichment
  25. 2026-08-12 16:39 UTCEG score recompute
  26. 2026-08-12 16:39 UTCGHSA enrichment
  27. 2026-08-12 13:48 UTCEPSS rescore
  28. 2026-08-11 23:26 UTCGHSA enrichment
  29. 2026-08-11 19:42 UTCGHSA enrichment
  30. 2026-08-11 15:48 UTCEG score recompute
  31. 2026-08-11 15:48 UTCGHSA enrichment
  32. 2026-08-11 13:38 UTCEPSS rescore
  33. 2026-08-11 08:43 UTCGHSA enrichment
  34. 2026-08-11 04:58 UTCGHSA enrichment
  35. 2026-08-11 01:13 UTCEG score recompute
  36. 2026-08-11 01:13 UTCGHSA enrichment
  37. 2026-08-10 12:43 UTCGHSA enrichment
  38. 2026-08-10 08:59 UTCGHSA enrichment
  39. 2026-08-10 05:14 UTCGHSA enrichment
  40. 2026-08-10 01:28 UTCGHSA enrichment
  41. 2026-08-09 21:43 UTCGHSA enrichment
  42. 2026-08-09 17:58 UTCGHSA enrichment
  43. 2026-08-09 14:14 UTCEG score recompute
  44. 2026-08-09 14:14 UTCGHSA enrichment
  45. 2026-08-09 13:44 UTCEPSS rescore
  46. 2026-08-09 10:28 UTCGHSA enrichment
  47. 2026-08-09 06:04 UTCGHSA enrichment
  48. 2026-08-09 02:19 UTCEG score recompute
  49. 2026-08-09 02:19 UTCGHSA enrichment
  50. 2026-08-08 16:34 UTCEPSS rescore
  51. 2026-08-08 10:51 UTCGHSA enrichment
  52. 2026-08-08 06:59 UTCGHSA enrichment
  53. 2026-08-08 03:14 UTCGHSA enrichment
  54. 2026-08-07 23:29 UTCGHSA enrichment
  55. 2026-08-07 19:44 UTCEG score recompute
  56. 2026-08-07 19:44 UTCGHSA enrichment
  57. 2026-08-07 16:24 UTCEPSS rescore
  58. 2026-08-07 16:00 UTCGHSA enrichment
  59. 2026-08-07 12:14 UTCGHSA enrichment
  60. 2026-08-07 08:13 UTCGHSA enrichment
  61. 2026-08-07 01:40 UTCGHSA enrichment
  62. 2026-08-06 20:35 UTCGHSA enrichment
  63. 2026-08-06 16:51 UTCEG score recompute
  64. 2026-08-06 16:51 UTCGHSA enrichment
  65. 2026-08-06 13:44 UTCEPSS rescore
  66. 2026-08-06 13:03 UTCGHSA enrichment
  67. 2026-08-06 09:18 UTCGHSA enrichment
  68. 2026-08-06 05:31 UTCGHSA enrichment
  69. 2026-08-06 01:46 UTCGHSA enrichment
  70. 2026-08-05 22:02 UTCEG score recompute
  71. 2026-08-05 22:02 UTCGHSA enrichment
  72. 2026-08-05 19:15 UTCEPSS rescore
  73. 2026-08-04 15:06 UTCEPSS rescore
  74. 2026-08-04 10:34 UTCEPSS rescore
  75. 2026-08-04 03:00 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 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 64.2% 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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