CVE-2026-115541

HIGHPre-NVD 7.27.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (34th 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 — 4 sources updated this week

Also known asEUVD-2026-116535 (ENISA EUVD)Source: ENISA EUVD

7.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fixed versions, as the CVE record's CNA (Fluid Attacks) states them: "The vendor fixed the issue in 1.19.1 and 1.18.7; 1.19.1 was not separately released."

HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded display name into a modal through jQuery html(), causing attacker-controlled markup to execute in the victim's HumHub origin.

CVSS v3
7.2
EG Score
7.2HIGHmedium confidence
EG Risk
33
EG Risk 33/100

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)
Severity72% × 45%
Impact severity (EG Severity): CVSS 7.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
34th
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 (7.2): severity, escalated by confirmed exploitation. This CVE's 7.2 is its impact severity (EG Severity), not escalated.

EG Severity
7.2 HIGHCVSS-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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-06). 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.

A fix is available. 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

November 3, 2026

Last Modified

November 6, 2026

Advisory Details (7)

Auto-updated Nov 6, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_release.
GitHub release Patch Available

1.18.7

Patch available: humhub/humhub v1.18.7

https://github.com/humhub/humhub/releases/tag/v1.18.7
GitHub release Patch Available

1.19.3

Patch available: humhub/humhub v1.19.3

https://github.com/humhub/humhub/releases/tag/v1.19.3
GitHub pull request Patch Available

Stored XSS via the user display name in the friendship confirmation dialog

Patch available: humhub/humhub v1.18.7 (PR #8625 merged 2026-10-23)

https://github.com/humhub/humhub/pull/8625
GitHub pull request Patch Available

Stored XSS via the user display name in the friendship confirmation dialog

Patch available: humhub/humhub v1.19.2 (PR #8624 merged 2026-10-23)

https://github.com/humhub/humhub/pull/8624
GitHub advisoryMentions a patch (unverified)

Stored cross-site scripting via the user display name in the friendship confirmation dialog · Advisory · humhub/humhub · GitHub

https://github.com/humhub/humhub/security/advisories/GHSA-ph8x-wg86-qp2m
Web page

GitHub - humhub/humhub: HumHub is an Open Source Enterprise Social Network. Easy to install, intuitive to use and extendable with countless freely available modules. · GitHub

https://github.com/humhub/humhub
Web page🟡 PoC Available

CVE-2026-115541: HumHub 1.19.0 Stored XSS | Fluid Attacks

https://fluidattacks.com/advisories/toujours

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 10× 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. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-11-06 20:27 UTCEG score recompute
  3. 2026-11-06 19:37 UTCEG score recompute
  4. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-11-03 23:03 UTCENISA EUVD ID recordedEUVD-2026-116535 · Source: ENISA EUVD
  8. 2026-11-03 22:28 UTCEG score recompute
  9. 2026-11-03 22:09 UTCEG score recomputeFirst assessed: 7.2 HIGH
  10. 2026-11-03 22:06 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-115541?
CVE-2026-115541 is a high-severity vulnerability; its CVE record was published on November 3, 2026. HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded…
When was the CVE record for CVE-2026-115541 published?
The CVE record for CVE-2026-115541 was published on November 3, 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 November 6, 2026; the record at its source may have been updated since.
Is CVE-2026-115541 actively exploited?
CVE-2026-115541 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-115541?
CVE-2026-115541 has a CVSS base score of 7.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-115541?
A fix for CVE-2026-115541 is available: update to the fixed version the vendor names in its advisory. Fixed versions, as the CVE record's CNA (Fluid Attacks) states them: "The vendor fixed the issue in 1.19.1 and 1.18.7; 1.19.1 was not separately released."

Dependency Blast Radius

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