CVE-2026-39915

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

TIM Flow before 26.0.6 contains a CRLF injection vulnerability that allows remote attackers to inject arbitrary HTTP headers and response body content by embedding unsanitized carriage return and line feed sequences in the rt URL parameter, which is reflected into Set-Cookie response headers. Attackers can craft malicious requests to induce authenticated users to execute arbitrary JavaScript in their browser context, enabling session token theft and account credential modification.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 24, 2026

Advisory Details (2)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

TIM Flow < 26.0.6 CRLF Injection via rt Parameter and access_token Cookie | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tim-flow-crlf-injection-via-rt-parameter-and-access-token-cookie
generic
https://tim-doc.atlassian.net/wiki/spaces/eng/pages/230981636/Release+Notes

Vendor Advisories for CVE-2026-39915(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 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-25 17:50 UTCEG score recompute
  2. 2026-08-25 17:50 UTCGHSA enrichment
  3. 2026-08-25 13:49 UTCEPSS rescore
  4. 2026-08-25 05:34 UTCGHSA enrichment
  5. 2026-08-24 17:19 UTCGHSA enrichment
  6. 2026-08-24 16:25 UTCEG score recompute
  7. 2026-08-24 16:25 UTCGHSA enrichment
  8. 2026-08-24 15:32 UTCEG score recompute
  9. 2026-08-24 15:32 UTCGHSA enrichment
  10. 2026-08-24 15:23 UTCEG score recompute
  11. 2026-08-24 14:21 UTCEG score recompute
  12. 2026-08-24 14:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-39915?
CVE-2026-39915 is a high vulnerability published on August 24, 2026. TIM Flow before 26.0.6 contains a CRLF injection vulnerability that allows remote attackers to inject arbitrary HTTP headers and response body content by embedding unsanitized carriage return and line feed sequences in the rt URL parameter, which is reflected into Set-Cookie response headers.…
When was CVE-2026-39915 disclosed?
CVE-2026-39915 was first published in the National Vulnerability Database on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39915 actively exploited?
CVE-2026-39915 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.5% of all scored CVEs.
What is the CVSS score of CVE-2026-39915?
CVE-2026-39915 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-39915?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39915, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-39915

Explore →

Is Your Infrastructure Affected by CVE-2026-39915?

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

Start Free Scan →Browse All CVEs