CVE-2026-77989

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% (36th 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 at low or medium mission impact and sooner than that at high (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.

The CVE record's description, written by its CNA (Joomla! Project), states the affected versions: "Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() e…" No release containing a fix is confirmed on record.

Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() echoes it unescaped, leading to an reflected XSS vector.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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-2026-77989(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 17× in last 7d / 77× 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 131 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 33 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-12 15:37 UTCEG score recompute
  4. 2026-10-11 19:23 UTCEG score recompute
  5. 2026-10-11 16:39 UTCEG score recompute
  6. 2026-10-11 13:57 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-10 06:49 UTCEG score recompute
  10. 2026-10-10 06:49 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-09 05:18 UTCEG score recompute
  13. 2026-10-09 05:17 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-08 03:47 UTCEG score recompute
  16. 2026-10-08 03:47 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-07 02:21 UTCEG score recompute
  19. 2026-10-07 02:21 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-06 00:56 UTCEG score recompute
  22. 2026-10-06 00:56 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-04 19:40 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
Show 73 more
  1. 2026-10-03 16:03 UTCEG score recompute
  2. 2026-10-03 16:03 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  3. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-02 07:58 UTCEG score recompute
  5. 2026-10-02 07:58 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  6. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-01 06:34 UTCEG score recompute
  8. 2026-10-01 06:34 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  9. 2026-09-30 05:09 UTCEG score recompute
  10. 2026-09-30 05:09 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  11. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-09-28 22:22 UTCEG score recompute
  13. 2026-09-28 22:22 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  14. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-09-27 20:49 UTCEG score recompute
  16. 2026-09-27 20:49 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-09-26 19:24 UTCEG score recompute
  19. 2026-09-26 19:24 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  20. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-09-25 07:24 UTCEG score recompute
  23. 2026-09-25 07:24 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-09-24 05:58 UTCEG score recompute
  26. 2026-09-24 05:58 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  27. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  28. 2026-09-23 04:33 UTCEG score recompute
  29. 2026-09-23 04:33 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  30. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  31. 2026-09-22 03:08 UTCEG score recompute
  32. 2026-09-22 03:07 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  33. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  34. 2026-09-21 01:40 UTCEG score recompute
  35. 2026-09-21 01:40 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  36. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  37. 2026-09-20 00:15 UTCEG score recompute
  38. 2026-09-20 00:15 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  39. 2026-09-18 22:50 UTCEG score recompute
  40. 2026-09-18 22:50 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  41. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  42. 2026-09-17 21:25 UTCEG score recompute
  43. 2026-09-17 21:25 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  44. 2026-09-16 20:00 UTCEG score recompute
  45. 2026-09-16 20:00 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  46. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  47. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  48. 2026-09-15 18:29 UTCEG score recompute
  49. 2026-09-15 18:29 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  50. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  51. 2026-09-14 16:20 UTCEG score recompute
  52. 2026-09-14 16:20 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  53. 2026-09-13 14:56 UTCEG score recompute
  54. 2026-09-13 14:56 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  55. 2026-09-12 13:17 UTCEG score recompute
  56. 2026-09-12 13:17 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  57. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  58. 2026-09-11 11:52 UTCEG score recompute
  59. 2026-09-11 11:52 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  60. 2026-09-10 09:45 UTCEG score recompute
  61. 2026-09-10 09:45 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  62. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  63. 2026-09-09 08:20 UTCEG score recompute
  64. 2026-09-09 08:20 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  65. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  66. 2026-09-08 06:56 UTCEG score recompute
  67. 2026-09-08 06:56 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  68. 2026-09-07 05:27 UTCEG score recompute
  69. 2026-09-07 05:27 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  70. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  71. 2026-09-06 04:01 UTCEG score recompute
  72. 2026-09-06 04:01 UTCGHSA enrichmentGHSA-x373-x8fh-6pfh
  73. 2026-09-05 02:36 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77989?
CVE-2026-77989 is a medium-severity vulnerability; its CVE record was published on August 27, 2026. Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() echoes it unescaped, leading to an reflected XSS vector.
When was the CVE record for CVE-2026-77989 published?
The CVE record for CVE-2026-77989 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-2026-77989 actively exploited?
CVE-2026-77989 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77989?
CVE-2026-77989 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-2026-77989?
No fix for CVE-2026-77989 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 CVE record's description, written by its CNA (Joomla! Project), states the affected versions: "Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() e…" No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-77989 are linked in the Vendor Advisories panel on this page.

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