CVE-2026-84463

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (4th 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

Also known asEUVD-2026-87264 (ENISA EUVD)Source: ENISA EUVD

6.3EG
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: 0.1%CVSS: 6.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, a user with Knowledge Base editing rights for a category can embed a video widget in a published answer with a specially crafted value. When the answer is rendered, that value is inserted into the page's HTML without being escaped for its attribute context, allowing it to break out and inject additional HTML into the page. When another user who has permission to switch between user sessions views the affected answer, the injected HTML causes their browser to silently send a request to Zammad's session-switching endpoint using their own active credentials. This results in switching their session to an account chosen by the person who wrote the Knowledge Base answer. No action is required from the viewer beyond opening the published answer. This issue is fixed in version 7.1.2.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
4th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

The CVE record names the fixed release. Apply it within your standard update timelines.

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.

The score's inputs: 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

September 25, 2026

Last Modified

September 29, 2026

Advisory Details (2)

Auto-updated Sep 25, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub commit

commit f7a97ea20969 (zammad/zammad)

Fix landed in zammad/zammad commit f7a97ea20969 — awaiting tagged release

https://github.com/zammad/zammad/commit/f7a97ea209696bce85ed62901ee753b88368851c
GitHub advisoryMentions a patch (unverified)

Stored HTML injection in Knowledge Base video widget enables forced session switching via unescaped iframe attribute · Advisory · zammad/zammad · GitHub

https://github.com/zammad/zammad/security/advisories/GHSA-cxjg-4gmf-5xqc

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 45× 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.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  4. 2026-10-30 00:55 UTCOSV refresh
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  7. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  8. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  9. 2026-10-25 13:56 UTCEG score recompute
  10. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-22 13:00 UTCEG score recompute
  14. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-18 03:06 UTCEG score recompute
  19. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-10-12 14:53 UTCEG score recompute
Show 37 more
  1. 2026-10-11 19:18 UTCEG score recompute
  2. 2026-10-11 16:35 UTCEG score recompute
  3. 2026-10-11 13:52 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-11 06:31 UTCEG score recompute
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-10 07:39 UTCEG score recompute
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-09 08:50 UTCEG score recompute
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-08 09:53 UTCEG score recompute
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-07 11:05 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-06 12:16 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-05 13:27 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-03 15:50 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-02 16:59 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-09-30 19:19 UTCEG score recompute
  25. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-09-29 20:31 UTCEG score recompute
  27. 2026-09-29 19:55 UTCEG score recompute
  28. 2026-09-29 13:44 UTCEG score recompute
  29. 2026-09-28 14:51 UTCEG score recompute
  30. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-27 17:11 UTCEG score recompute
  32. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-09-26 18:23 UTCEG score recompute
  34. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-09-25 19:34 UTCEG score recompute
  36. 2026-09-25 18:32 UTCEG score recomputeFirst assessed: 6.3 MEDIUM
  37. 2026-09-25 18:31 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-84463?
CVE-2026-84463 is a medium-severity vulnerability; its CVE record was published on September 25, 2026. Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, a user with Knowledge Base editing rights for a category can embed a video widget in a published answer with a specially crafted value. When the answer is rendered, that value is inserted into the page's HTML…
When was the CVE record for CVE-2026-84463 published?
The CVE record for CVE-2026-84463 was published on September 25, 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 September 29, 2026; the record at its source may have been updated since.
Is CVE-2026-84463 actively exploited?
CVE-2026-84463 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-84463?
CVE-2026-84463 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-84463?
The CVE record for CVE-2026-84463 names the fix: "This issue is fixed in version 7.1.2."

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