CVE-2026-77990

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: None knownExposed services: Not assessed

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

Joomla Extension - joomlaeventmanager.net - Attendee lists readable by any logged-in user in Joomla Event Manager < 5.0.1 - A non-manager can therefore read attendee names, usernames, registration dates and statuses for events they do not manage, including lists belonging to unpublished events.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 27, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 27, 2026
No fix on record yet.
Web page

JEM - Joomla Event Manager

https://www.joomlaeventmanager.net/

Vendor Advisories for CVE-2026-77990(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 20× in last 7d / 76× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 126 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 28 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:23 UTCEG score recompute
  2. 2026-10-11 16:39 UTCEG score recompute
  3. 2026-10-11 13:57 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  6. 2026-10-10 05:23 UTCEG score recompute
  7. 2026-10-10 05:23 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  9. 2026-10-09 03:12 UTCEG score recompute
  10. 2026-10-09 03:12 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  12. 2026-10-08 01:24 UTCEG score recompute
  13. 2026-10-08 01:24 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-10-06 22:20 UTCEG score recompute
  16. 2026-10-06 22:20 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  18. 2026-10-05 21:00 UTCEG score recompute
  19. 2026-10-05 20:59 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  22. 2026-10-04 19:40 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  23. 2026-10-03 16:03 UTCEG score recompute
  24. 2026-10-03 16:03 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  25. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 26th percentile
Show 73 more
  1. 2026-10-02 07:54 UTCEG score recompute
  2. 2026-10-02 07:54 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  3. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  4. 2026-10-01 06:28 UTCEG score recompute
  5. 2026-10-01 06:28 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  6. 2026-09-30 05:09 UTCEG score recompute
  7. 2026-09-30 05:09 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  8. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  9. 2026-09-28 22:03 UTCEG score recompute
  10. 2026-09-28 22:03 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  11. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  12. 2026-09-27 20:43 UTCEG score recompute
  13. 2026-09-27 20:43 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-09-26 19:24 UTCEG score recompute
  16. 2026-09-26 19:24 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  18. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  19. 2026-09-25 06:13 UTCEG score recompute
  20. 2026-09-25 06:13 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  21. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 25th percentile
  22. 2026-09-24 04:53 UTCEG score recompute
  23. 2026-09-24 04:53 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-09-23 03:33 UTCEG score recompute
  26. 2026-09-23 03:33 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  27. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-09-22 02:14 UTCEG score recompute
  29. 2026-09-22 02:14 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  30. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  31. 2026-09-21 00:54 UTCEG score recompute
  32. 2026-09-21 00:54 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  33. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  34. 2026-09-19 23:34 UTCEG score recompute
  35. 2026-09-19 23:34 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  36. 2026-09-18 22:15 UTCEG score recompute
  37. 2026-09-18 22:15 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  39. 2026-09-17 20:55 UTCEG score recompute
  40. 2026-09-17 20:55 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  41. 2026-09-16 19:04 UTCEG score recompute
  42. 2026-09-16 19:04 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  43. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  45. 2026-09-15 15:11 UTCEG score recompute
  46. 2026-09-15 15:11 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  47. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  48. 2026-09-14 13:51 UTCEG score recompute
  49. 2026-09-14 13:51 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  50. 2026-09-13 12:31 UTCEG score recompute
  51. 2026-09-13 12:31 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  52. 2026-09-12 11:11 UTCEG score recompute
  53. 2026-09-12 11:11 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  54. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  55. 2026-09-11 09:40 UTCEG score recompute
  56. 2026-09-11 09:40 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  57. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  58. 2026-09-10 08:20 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  59. 2026-09-09 06:59 UTCEG score recompute
  60. 2026-09-09 06:59 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  62. 2026-09-08 05:40 UTCEG score recompute
  63. 2026-09-08 05:40 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  64. 2026-09-07 04:16 UTCEG score recompute
  65. 2026-09-07 04:16 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  66. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  67. 2026-09-06 02:55 UTCEG score recompute
  68. 2026-09-06 02:55 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  69. 2026-09-05 01:36 UTCEG score recompute
  70. 2026-09-05 01:36 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  71. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  72. 2026-09-04 00:16 UTCGHSA enrichmentGHSA-839q-fphm-4fh3
  73. 2026-09-02 22:54 UTCGHSA enrichmentGHSA-839q-fphm-4fh3

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77990?
CVE-2026-77990 is a medium-severity vulnerability; its CVE record was published on August 27, 2026. Joomla Extension - joomlaeventmanager.net - Attendee lists readable by any logged-in user in Joomla Event Manager < 5.0.1 - A non-manager can therefore read attendee names, usernames, registration dates and statuses for events they do not manage, including lists belonging to unpublished events.
When was the CVE record for CVE-2026-77990 published?
The CVE record for CVE-2026-77990 was published on August 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 28, 2026; the record at its source may have been updated since.
Is CVE-2026-77990 actively exploited?
CVE-2026-77990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77990?
CVE-2026-77990 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77990?
No fix for CVE-2026-77990 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77990 are linked in the Vendor Advisories panel on this page.

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