CVE-2026-78903

LOWPre-NVD 3.13.1—
EchelonGraph scoreHIGH confidence

Score 3.1 from GitHub Security Advisory (severity: LOW) published 2026-08-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 3.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
3.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.1Exploit: Elevated riskExposed: 0

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

Incomplete cleanup in SiteIsolation in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
3.1
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
3.1(high)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity31% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 25, 2026

Last Modified

September 17, 2026

References (2)

Vendor Advisories for CVE-2026-78903(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium113.0.5672.126-1 ... 152.0.7977.64-1 (412 versions)152.0.7977.75-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 152.0.7977.75-1~deb12u1 (178 versions)152.0.7977.75-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium138.0.7204.183-1 ... 152.0.7977.75-1~deb13u1 (180 versions)——

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 52× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:04 UTCEG score recompute
  3. 2026-09-17 19:04 UTCVendor advisory
  4. 2026-09-17 19:03 UTCGHSA enrichment
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 14:11 UTCEG score recompute
  8. 2026-09-15 14:11 UTCVendor advisory
  9. 2026-09-15 14:11 UTCGHSA enrichment
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-12 14:52 UTCEG score recompute
  13. 2026-09-12 14:52 UTCVendor advisory
  14. 2026-09-12 14:52 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-09 15:33 UTCEG score recompute
  18. 2026-09-09 15:33 UTCVendor advisory
  19. 2026-09-09 15:33 UTCGHSA enrichment
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-06 16:13 UTCEG score recompute
  22. 2026-09-06 16:13 UTCVendor advisory
  23. 2026-09-06 16:13 UTCGHSA enrichment
  24. 2026-09-06 13:48 UTCEPSS rescore
  25. 2026-09-04 05:07 UTCEPSS rescore
Show 27 more
  1. 2026-09-03 16:54 UTCEG score recompute
  2. 2026-09-03 16:54 UTCVendor advisory
  3. 2026-09-03 16:54 UTCGHSA enrichment
  4. 2026-09-02 14:12 UTCEPSS rescore
  5. 2026-09-01 13:54 UTCEPSS rescore
  6. 2026-09-01 04:40 UTCEPSS rescore
  7. 2026-09-01 04:40 UTCEPSS rescore
  8. 2026-08-31 17:34 UTCEG score recompute
  9. 2026-08-31 17:34 UTCVendor advisory
  10. 2026-08-31 17:34 UTCGHSA enrichment
  11. 2026-08-30 19:18 UTCEPSS rescore
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 01:22 UTCEPSS rescore
  14. 2026-08-28 21:42 UTCEPSS rescore
  15. 2026-08-28 16:14 UTCEG score recompute
  16. 2026-08-28 16:13 UTCGHSA enrichment
  17. 2026-08-27 20:19 UTCEG score recompute▼ 3.40
  18. 2026-08-27 20:19 UTCGHSA enrichment
  19. 2026-08-27 20:13 UTCMITRE cvelistV5CVSS v3 → 3.1 · severity → LOW
  20. 2026-08-27 16:31 UTCGHSA enrichment
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 16:40 UTCEG score recompute
  23. 2026-08-26 16:40 UTCGHSA enrichment
  24. 2026-08-26 14:47 UTCEPSS rescore
  25. 2026-08-25 21:25 UTCNVD update
  26. 2026-08-25 20:29 UTCEG score recompute
  27. 2026-08-25 20:25 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCvxssroott/CVE-2026-78903-SWIFT-Kick-to-the-Creds
    First seen Aug 30, 2026

    Offensive Research & Exploit Development. Vulnerability research, PoC development, and offensive tooling for financial infrastructure.

    Open source ↗

Frequently asked(5)

What is CVE-2026-78903?
CVE-2026-78903 is a low vulnerability published on August 25, 2026. Incomplete cleanup in SiteIsolation in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-78903 disclosed?
CVE-2026-78903 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78903 actively exploited?
CVE-2026-78903 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 80.8% of all scored CVEs.
What is the CVSS score of CVE-2026-78903?
CVE-2026-78903 has a CVSS v3.1 base score of 3.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78903?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78903, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-78903

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