CVE-2026-18311

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: None knownExposed services: Not assessed

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

Readwise Reader for Android contains a cross-site scripting vulnerability due to missing HTML sanitization in its processing of imported document metadata. Attacker-controlled fields such as the author meta tag are inserted into a WebView via innerHTML, enabling stored XSS that executes on synced devices when the malicious document is opened.

CVSS v3
6.1
EG Score
6.1MEDIUMhigh confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 28, 2026

Advisory Details (1)

Auto-updated Sep 25, 2026
No patch confirmed yet. Sources: cert.
cert

VU#699627 - Readwise Reader for Android, version 8.7.2, contains multiple XSS vulnerabilities

https://kb.cert.org/vuls/id/699627

Vendor Advisories for CVE-2026-18311(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 18× in last 7d / 28× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 15:18 UTCGHSA enrichment
  3. 2026-10-03 15:35 UTCEG score recompute
  4. 2026-10-03 15:35 UTCGHSA enrichment
  5. 2026-10-03 14:25 UTCEPSS rescore
  6. 2026-10-02 15:54 UTCEG score recompute
  7. 2026-10-02 15:54 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-10-01 16:15 UTCGHSA enrichment
  10. 2026-09-30 16:35 UTCEG score recompute
  11. 2026-09-30 16:35 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-29 16:23 UTCEG score recompute
  14. 2026-09-29 16:23 UTCGHSA enrichment
  15. 2026-09-29 15:20 UTCEPSS rescore
  16. 2026-09-28 16:41 UTCEG score recompute
  17. 2026-09-28 16:41 UTCGHSA enrichment
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-27 16:53 UTCEG score recompute
  20. 2026-09-27 16:53 UTCGHSA enrichment
  21. 2026-09-27 13:47 UTCEPSS rescore
  22. 2026-09-26 17:14 UTCEG score recompute
  23. 2026-09-26 17:14 UTCGHSA enrichment
  24. 2026-09-26 15:58 UTCEPSS rescore
  25. 2026-09-25 17:04 UTCEG score recompute▲ 6.10
Show 3 more
  1. 2026-09-25 17:04 UTCMITRE cvelistV5CVSS v3 → 6.1 · severity → MEDIUM
  2. 2026-09-25 16:39 UTCEG score recompute
  3. 2026-09-25 16:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18311?
CVE-2026-18311 is a medium vulnerability published on September 25, 2026. Readwise Reader for Android contains a cross-site scripting vulnerability due to missing HTML sanitization in its processing of imported document metadata. Attacker-controlled fields such as the author meta tag are inserted into a WebView via innerHTML, enabling stored XSS that executes on synced…
When was CVE-2026-18311 disclosed?
CVE-2026-18311 was first published on September 25, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18311 actively exploited?
CVE-2026-18311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18311?
CVE-2026-18311 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18311?
No fix for CVE-2026-18311 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18311 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18311

Explore →

Is Your Infrastructure Affected by CVE-2026-18311?

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

Book a Demo →Browse All CVEs