CVE-2026-18266

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

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

Score 5.4 from GitHub Security Advisory published 2026-07-29. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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

Dify AI Workflow oauth_redirect_url Open Redirect Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Dify. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the OAuth flow handling in the AppInitializer component. An attacker can force a redirection to a site that serves malicious content. An attacker can leverage this vulnerability to disclose information in the context of the application. Was ZDI-CAN-29196.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: 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
0.3%
EPSS %ILE
19th
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 (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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 every mission impact level.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: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). 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.

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

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Jul 29, 2026
No fix on record yet.
Web page

ZDI-26-452 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-26-452/

Vendor Advisories for CVE-2026-18266(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 8× 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.

Showing the most recent 100 of 188 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 88 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-18 03:59 UTCEG score recompute
  4. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-12 16:27 UTCEG score recompute
  11. 2026-10-11 20:07 UTCEG score recompute
  12. 2026-10-11 17:20 UTCEG score recompute
  13. 2026-10-11 14:52 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-07 00:00 UTCEG score recompute
  20. 2026-10-07 00:00 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  21. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-10-05 20:50 UTCEG score recompute
  23. 2026-10-05 20:50 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  24. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 75 more
  1. 2026-10-04 06:59 UTCEG score recompute
  2. 2026-10-04 06:59 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  3. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-02 17:56 UTCEG score recompute
  5. 2026-10-02 17:56 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  6. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-10-01 03:32 UTCEG score recompute
  8. 2026-10-01 03:32 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  9. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-09-29 07:33 UTCEG score recompute
  12. 2026-09-29 07:33 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-09-27 19:35 UTCEG score recompute
  15. 2026-09-27 19:35 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  16. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-09-25 05:35 UTCEG score recompute
  19. 2026-09-25 05:35 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  20. 2026-09-23 21:48 UTCEG score recompute
  21. 2026-09-23 21:48 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  22. 2026-09-22 15:47 UTCEG score recompute
  23. 2026-09-22 15:47 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  24. 2026-09-20 00:21 UTCEG score recompute
  25. 2026-09-20 00:21 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  26. 2026-09-19 00:05 UTCEG score recompute
  27. 2026-09-19 00:04 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  28. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  29. 2026-09-18 01:57 UTCEG score recompute
  30. 2026-09-18 01:57 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  31. 2026-09-17 03:56 UTCEG score recompute
  32. 2026-09-17 03:56 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  33. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  34. 2026-09-16 05:49 UTCEG score recompute
  35. 2026-09-16 05:48 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  36. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  37. 2026-09-15 07:48 UTCEG score recompute
  38. 2026-09-15 07:48 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  39. 2026-09-13 23:19 UTCEG score recompute
  40. 2026-09-13 23:19 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  41. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  42. 2026-09-13 01:19 UTCEG score recompute
  43. 2026-09-13 01:19 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  44. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  45. 2026-09-12 03:19 UTCEG score recompute
  46. 2026-09-12 03:19 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  47. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  48. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  49. 2026-09-11 05:18 UTCEG score recompute
  50. 2026-09-11 05:18 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  51. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  52. 2026-09-10 07:11 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  53. 2026-09-09 07:45 UTCEG score recompute
  54. 2026-09-09 07:45 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  55. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  56. 2026-09-07 20:37 UTCEG score recompute
  57. 2026-09-07 20:37 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  58. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  59. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  60. 2026-09-06 07:56 UTCEG score recompute
  61. 2026-09-06 07:55 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  62. 2026-09-05 09:54 UTCEG score recompute
  63. 2026-09-05 09:54 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  64. 2026-09-04 11:54 UTCEG score recompute
  65. 2026-09-04 11:54 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  66. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  67. 2026-09-01 22:45 UTCEG score recompute
  68. 2026-09-01 22:45 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  69. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  70. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  71. 2026-08-31 23:53 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  72. 2026-08-30 21:10 UTCEG score recompute
  73. 2026-08-30 21:10 UTCGHSA enrichmentGHSA-hvq6-f5p6-23f6 · GitHub CVSS 5.4
  74. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  75. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile

Frequently asked(5)

What is CVE-2026-18266?
CVE-2026-18266 is a medium-severity vulnerability; its CVE record was published on July 29, 2026. Dify AI Workflow oauthredirecturl Open Redirect Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Dify. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a…
When was CVE-2026-18266 made public?
CVE-2026-18266 was made public on July 29, 2026: that is the date its CVE record's CNA, Zero Day Initiative, gives for when the vulnerability was made public. The CVE record itself was published on July 29, 2026. EchelonGraph's copy of the record carries a last-modified date of July 30, 2026; the record at its source may have been updated since.
Is CVE-2026-18266 actively exploited?
CVE-2026-18266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18266?
CVE-2026-18266 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18266?
No fix for CVE-2026-18266 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-2026-18266 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18266

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