CVE-2026-110628

HIGHPre-NVD 8.68.6
EchelonGraph scoreHIGH confidence

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

Score 8.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-14. A secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.

CVSS v3
8.6
EG Score
8.6HIGHhigh confidence
EG Risk
54
EG Risk 54/100

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)
Severity86% × 45%
Impact severity (EG Severity): CVSS 8.6 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.
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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
35th
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 (8.6): severity, escalated by confirmed exploitation. This CVE's 8.6 is its impact severity (EG Severity), not escalated.

EG Severity
8.6 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

October 14, 2026

Last Modified

October 16, 2026

Advisory Details (8)

Auto-updated Oct 14, 2026
Patch available. Sources: github_commit, github_pr, github.
Web page

Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment | Advisories | VulnCheck

https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment
Web page

GitHub - kanbn/kan: The open source Trello alternative. · GitHub

https://github.com/kanbn/kan
GitHub commit Patch Available

commit 53397d8e81dc (kanbn/kan)

Patch available: kanbn/kan v0.5.5 (contains commit 53397d8e81dc)

https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7
GitHub advisoryMentions a patch (unverified)

Unauthenticated SSRF in attachment download endpoint · Advisory · kanbn/kan · GitHub

https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg
Web page

kan/.env.example at v0.6.0 · kanbn/kan · GitHub

https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27
Web page

kan/apps/web/src/pages/api/download/attatchment.ts at v0.6.0 · kanbn/kan · GitHub

https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52
GitHub pull request

fix: validate attachment download URLs when S3_ENDPOINT is unset

Upstream fix in progress (PR #590 · kanbn/kan, state=open)

https://github.com/kanbn/kan/pull/590
Web page

Kan - Unauthenticated full-read SSRF in attachment download proxy - HackMD

https://hackmd.io/@leediay/HyIxU63ofg

Vendor Advisories for CVE-2026-110628(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 14× in last 7d / 17× 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. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-20 19:09 UTCEG score recompute
  3. 2026-10-20 19:09 UTCGHSA enrichmentGHSA-8p5c-vr7c-5g49 · GitHub severity CRITICAL · GitHub CVSS 8.6
  4. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-18 05:06 UTCEG score recompute
  8. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-16 18:30 UTCEG score recompute
  10. 2026-10-16 18:29 UTCGHSA enrichmentGHSA-8p5c-vr7c-5g49 · GitHub severity CRITICAL · GitHub CVSS 8.6
  11. 2026-10-16 17:22 UTCEG score recompute
  12. 2026-10-16 17:22 UTCGHSA enrichmentGHSA-8p5c-vr7c-5g49 · GitHub severity CRITICAL · GitHub CVSS 8.6
  13. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-14 15:30 UTCEG score recompute
  16. 2026-10-14 14:32 UTCEG score recomputeFirst assessed: 8.6 HIGH
  17. 2026-10-14 14:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-110628?
CVE-2026-110628 is a high-severity vulnerability; its CVE record was published on October 14, 2026. Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services,…
When was CVE-2026-110628 made public?
CVE-2026-110628 was made public on September 5, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on October 14, 2026. EchelonGraph's copy of the record carries a last-modified date of October 16, 2026; the record at its source may have been updated since.
Is CVE-2026-110628 actively exploited?
CVE-2026-110628 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-110628?
CVE-2026-110628 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-110628?
A fix for CVE-2026-110628 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-110628 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-110628

Explore →

Is Your Infrastructure Affected by CVE-2026-110628?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.