CVE-2026-75510

MEDIUMPre-NVD 5.15.1
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st 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 weekElevated

Also known asEUVD-2026-84535 (ENISA EUVD) · GHSA-8gr3-5j6f-25gp (GitHub Security Advisories)Source: ENISA EUVD

5.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through apps/api/src/app/inbox/utils/notification-mapper.ts and packages/js/src/ui/components/Notification/DefaultNotification.tsx to the navigate function in packages/js/src/ui/context/InboxContext.tsx without validating its URL scheme. An authenticated organization member or environment API-key holder can store a javascript: redirect with target _self in an in-app workflow. When a recipient using a Chromium-based browser clicks the notification, window.open executes the redirect in the current inbox-hosting origin, which can expose session material and permit authenticated actions in a customer application or the self-hosted Novu dashboard. This issue is fixed in version 3.18.0.

CVSS v3
5.1
EG Score
5.1MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity51% × 45%
Impact severity (EG Severity): CVSS 5.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.5%
EPSS %ILE
41st
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 (5.1): severity, escalated by confirmed exploitation. This CVE's 5.1 is its impact severity (EG Severity), not escalated.

EG Severity
5.1 MEDIUMCVSS-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
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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; Track* at high (mission-essential systems).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 low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (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

September 22, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 22, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
GitHub advisoryMentions a patch (unverified)

Stored XSS in In-App Inbox via notification redirect.url javascript: scheme · Advisory · novuhq/novu · GitHub

https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp
GitHub release Patch Available

v3.18.0

Patch available: novuhq/novu v3.18.0

https://github.com/novuhq/novu/releases/tag/v3.18.0
GitHub pull request Patch Available

fix(js): validate in-app redirect URLs in inbox API and client fixes NV-7971

Patch available: novuhq/novu @novu/framework@v2.11.1 (PR #11453 merged 2026-06-07)

https://github.com/novuhq/novu/pull/11453
GitHub commit Patch Available

commit f105f3d41a44 (novuhq/novu)

Patch available: novuhq/novu @novu/framework@v2.11.1 (contains commit f105f3d41a44)

https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a

Vendor Advisories for CVE-2026-75510(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npm@novu/js @ 3.18.0 (fixes <= 3.17.0)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
@novu/js—
  • every version up to 3.18.0: fixed in 3.18.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 48× 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. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-11-01 07:39 UTCGHSA enrichmentGHSA-8gr3-5j6f-25gp · GitHub severity MODERATE
  4. 2026-11-01 07:39 UTCEG score recompute
  5. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-30 06:25 UTCOSV refresh
  8. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-25 14:02 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  16. 2026-10-22 18:57 UTCEG score recompute
  17. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  18. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  19. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  20. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  21. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  22. 2026-10-18 03:13 UTCEG score recompute
  23. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  24. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  25. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
Show 45 more
  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  4. 2026-10-12 15:39 UTCEG score recompute
  5. 2026-10-11 19:25 UTCEG score recompute
  6. 2026-10-11 16:40 UTCEG score recompute
  7. 2026-10-11 13:59 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  9. 2026-10-11 08:43 UTCEG score recompute
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  11. 2026-10-10 07:58 UTCEG score recompute
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  13. 2026-10-09 07:16 UTCEG score recompute
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-10-08 06:36 UTCEG score recompute
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  17. 2026-10-07 05:55 UTCEG score recompute
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  19. 2026-10-06 05:14 UTCEG score recompute
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  21. 2026-10-05 04:26 UTCEG score recompute
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  23. 2026-10-04 03:45 UTCEG score recompute
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  25. 2026-10-03 03:05 UTCEG score recompute
  26. 2026-10-02 02:25 UTCEG score recompute
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  28. 2026-10-01 01:43 UTCEG score recompute
  29. 2026-09-30 01:03 UTCEG score recompute
  30. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  31. 2026-09-29 00:23 UTCEG score recompute
  32. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  33. 2026-09-27 23:42 UTCEG score recompute
  34. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  35. 2026-09-26 23:00 UTCEG score recompute
  36. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  37. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  38. 2026-09-24 17:59 UTCEG score recompute
  39. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  40. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  41. 2026-09-23 16:59 UTCEG score recompute
  42. 2026-09-22 16:19 UTCEG score recompute
  43. 2026-09-22 16:06 UTCEG score recompute
  44. 2026-09-22 15:55 UTCEG score recomputeFirst assessed: 5.1 MEDIUM
  45. 2026-09-22 15:54 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-75510?
CVE-2026-75510 is a medium-severity vulnerability; its CVE record was published on September 22, 2026. Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through…
When was the CVE record for CVE-2026-75510 published?
The CVE record for CVE-2026-75510 was published on September 22, 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 September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-75510 actively exploited?
CVE-2026-75510 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75510?
CVE-2026-75510 has a CVSS base score of 5.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75510?
A fix for CVE-2026-75510 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75510 are linked in the Vendor Advisories panel on this page.

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